Resource Library
Sleep science, translated
Plain-language, evidence-based answers to the questions patients, athletes, and product teams actually ask. Every article is written and reviewed by a board-certified behavioral sleep medicine specialist.
Ask Dr. Mason
Your questions can shape what we explore next.
Have a question about sleep, circadian rhythm, behavior change, or digital health? Submit it anonymously. Selected questions may be answered by Dr. Mason and added to this resource library in the future.
Please ask general educational questions only. Do not include your name, contact information, medical records, or other identifying details.
Questions worth answering
These questions were selected by Dr. Mason because they arise frequently in conversations about sleep, circadian rhythm, performance, technology, and behavior change. Answers are provided for general education and do not replace individualized evaluation or care.
6 answers
InsomniaSelected by Dr. Mason
How do I know whether I need CBT-I or just better sleep habits?
Better sleep habits can support sleep, but they are not the same as Cognitive Behavioral Therapy for Insomnia. When difficulty falling asleep, staying asleep, or returning to sleep becomes persistent and affects daytime functioning, a structured insomnia evaluation may be more useful than adding more sleep tips.
Open this answer on its own pageSleep hygiene focuses on general practices that support sleep, such as managing caffeine, maintaining a comfortable sleep environment, and allowing enough time for sleep. Those practices matter, but many people with chronic insomnia already know them.
CBT-I addresses the processes that keep insomnia going. Depending on the person, treatment may include:
- Reviewing sleep patterns with a sleep diary
- Adjusting time in bed to strengthen sleep consolidation
- Rebuilding the association between bed and sleep
- Reducing sleep-related monitoring, effort, and fear
- Working with thoughts that increase nighttime arousal
- Developing strategies for difficult nights and future disruptions
The distinction matters because insomnia is not always caused by poor sleep habits. A person may have an excellent bedroom routine and still experience conditioned arousal, an irregular sleep window, circadian misalignment, medication effects, pain, anxiety about sleep, or another sleep disorder.
Consider seeking an evaluation when sleep difficulty:
- Persists despite reasonable sleep habits
- Happens regularly rather than occasionally
- Affects mood, concentration, energy, performance, or safety
- Creates increasing fear or effort around bedtime
- Leads to spending substantially more time in bed trying to sleep
- Occurs alongside snoring, gasping, uncomfortable leg sensations, unusual nighttime behavior, or severe daytime sleepiness
A behavioral sleep medicine evaluation should also consider whether insomnia is the primary problem or whether another medical, circadian, psychiatric, or sleep condition needs attention.
CBT-I is a structured treatment, not a collection of generic sleep tips. The goal is to understand what is maintaining the sleep problem and choose interventions that fit that mechanism.
What to do next
If sleep difficulty has become persistent or is affecting your daytime life, review the Sleep Clinic and insomnia-treatment information.
Related resources
- Insomnia and CBT-I
- Sleep Clinic
- Sleep psychologist
- Contact the Sleep Clinic
- CBT-I vs. Sleep Hygiene
- How Long Does CBT-I Take?
- What Is Sleep Compression?
References
- Edinger JD, Arnedt JT, Bertisch SM, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Circadian rhythmSelected by Dr. Mason
Why can a consistent wake time help more than forcing an earlier bedtime?
Wake time influences both sleep pressure and circadian timing. Bedtime is harder to force because the body must be biologically ready for sleep. A reasonably consistent wake time gives the sleep-wake system a more dependable daily anchor.
Open this answer on its own pageSleep is regulated partly by two interacting processes.
The first is sleep pressure. It generally builds while you are awake and decreases while you sleep. When wake time changes substantially from day to day, sleep pressure begins accumulating at different times. That can make sleepiness less predictable at night.
The second is circadian timing. The circadian system helps determine when the body is prepared for sleep and wakefulness. Light is one of its strongest signals. Waking at a similar time and receiving appropriately timed morning light can help stabilize that rhythm.
This is why simply choosing an earlier bedtime often does not work. A person can create an opportunity for sleep, but cannot command the brain to become sleepy on demand. Going to bed much earlier than the body is ready may create more time awake in bed and more frustration about sleep.
A useful wake-time plan is realistic. It should account for:
- Work and school requirements
- Caregiving responsibilities
- Current sleep duration
- Safety and daytime sleepiness
- Weekends
- Travel
- Shift work
- The person’s underlying circadian tendency
Consistency does not require perfection. The goal is to reduce large, repeated shifts that make the sleep system constantly readjust.
People with severe sleepiness, bipolar-spectrum conditions, seizure disorders, complex medical conditions, or safety-sensitive responsibilities should obtain individualized guidance before making a substantial sleep-schedule change.
What to do next
Explore the circadian-rhythm resources or use the Clock Change Planner when preparing for a seasonal time change.
Related resources
- Clock Change Planner
- Sleep Clinic
- Why Wake Time Matters for Circadian Rhythm
- How to Shift Your Sleep Schedule
- Morning Light and Circadian Rhythm
References
- Auger RR, Burgess HJ, Emens JS, et al. Clinical practice guideline for the treatment of intrinsic circadian rhythm sleep-wake disorders. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Athlete sleep and performanceSelected by Dr. Mason
Why can an athlete feel wired after a late game even when physically exhausted?
Physical exhaustion and biological readiness for sleep are not the same thing. Competition can leave the nervous system activated while light, travel, caffeine, emotion, and body temperature continue signaling wakefulness.
Open this answer on its own pageA late competition can create several conditions that make immediate sleep unlikely.
The athlete may still be processing:
- Competitive arousal
- Elevated heart rate and body temperature
- Excitement, frustration, or performance review
- Bright venue and locker-room light
- Caffeine or other stimulants
- Postgame meals and hydration
- Media responsibilities
- Travel and unfamiliar environments
- Pain, soreness, or injury concerns
The goal should not be to force sleep immediately after the final whistle. A more useful approach is to create a repeatable transition from performance to recovery.
That transition might include:
- Completing essential recovery, nutrition, and hydration tasks
- Reducing stimulation in stages
- Using a familiar sequence after games
- Postponing detailed performance analysis when possible
- Managing caffeine according to game time and individual sensitivity
- Using breathing, relaxation, or another practiced downregulation skill
- Keeping the sleep environment cool, dark, quiet, and familiar
- Avoiding panic when sleep begins later than usual
Phone use also deserves a more precise conversation than “blue light is bad.” Bright light can affect circadian timing, but the content, social interaction, performance analysis, and emotional activation associated with the phone may be equally important after competition.
Athletes should not be given one universal sleep prescription. Competition time, travel, age, chronotype, recovery demands, sleep history, and the presence of a sleep disorder all matter.
If postcompetition insomnia becomes frequent, affects recovery or mood, or occurs outside competition nights, a fuller assessment may be warranted.
What to do next
Explore athlete sleep services for individual athletes, teams, coaches, and sports organizations.
Related resources
- Athlete Sleep & Performance
- Insomnia and CBT-I
- Speaking
- Contact us about athlete sleep
- Sleep and Performance
- Circadian Rhythm and Jet Lag
References
- Walsh NP, Halson SL, Sargent C, et al. Sleep and the athlete: narrative review and 2021 expert consensus recommendations. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Sleep across the lifespanSelected by Dr. Mason
Why does sleep often change during perimenopause and menopause?
Sleep changes during perimenopause and menopause can have more than one cause. Hormonal changes and hot flashes may contribute, but insomnia, sleep apnea, restless legs, mood, pain, caregiving demands, and other medical factors may also be involved.
Open this answer on its own pageIt is tempting to describe every midlife sleep problem as hormonal. Hormonal changes can matter, but the full picture is often more complex.
Sleep may be affected by:
- Hot flashes and night sweats
- Changes in circadian timing
- Increased sensitivity to nighttime disruption
- Stress, anxiety, or mood changes
- Caregiving or household demands
- Pain or other medical symptoms
- Medication effects
- Restless legs symptoms
- Obstructive sleep apnea
- Insomnia that has developed its own self-reinforcing pattern
The pattern matters. Someone who wakes primarily during a hot flash may need a different plan from someone who lies awake worrying about whether sleep will happen. A person with snoring, gasping, morning headaches, high blood pressure, or marked daytime sleepiness may need evaluation for sleep apnea. Uncomfortable sensations and an urge to move the legs may point toward restless legs syndrome and possible medical contributors such as iron deficiency.
CBT-I can be effective for persistent insomnia during and after the menopause transition. It does not treat every cause of disrupted sleep, and it does not replace evaluation or treatment of vasomotor symptoms, sleep apnea, restless legs, mood conditions, or other medical concerns.
Effective care may involve collaboration among behavioral sleep medicine, primary care, gynecology, and medical sleep medicine. The goal is not to assume that sleep disruption is inevitable. It is to identify which factors are active and match the treatment to them.
What to do next
Explore women’s sleep and behavioral sleep medicine services, or speak with an appropriate healthcare professional about persistent or concerning symptoms.
Related resources
- Women's sleep health
- Insomnia and CBT-I
- Sleep Clinic
- Contact the Sleep Clinic
- Women's Sleep Across the Lifespan
References
- American College of Obstetricians and Gynecologists. Sleep Health and Disorders. View source (opens in a new tab)
- Drake CL, Kalmbach DA, Arnedt JT, et al. Treating chronic insomnia in postmenopausal women: a randomized clinical trial comparing CBT-I, sleep restriction therapy, and sleep-hygiene education. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Wearables and digital healthSelected by Dr. Mason
Can my wearable tell me whether I have a sleep disorder?
A consumer wearable can help reveal patterns in sleep timing, duration, regularity, and recovery. It generally cannot diagnose a sleep disorder by itself, and its estimates should not be treated as equivalent to a clinical sleep study.
Open this answer on its own pageWearables can be useful, particularly when they help someone notice patterns across time.
Depending on the device and how it has been validated, potentially useful information may include:
- Approximate sleep and wake timing
- Changes in sleep duration
- Day-to-day regularity
- Resting heart rate trends
- Activity and recovery patterns
- Relationships between schedule, behavior, travel, illness, and sleep
The most visually impressive metric is not always the most trustworthy. Consumer devices estimate sleep from signals such as movement, heart rate, temperature, and oxygen-related measurements. They do not measure sleep in exactly the same way as clinical polysomnography.
Sleep-stage estimates, readiness scores, and proprietary composite scores should therefore be interpreted cautiously. A score can change because of the device, the algorithm, missing data, illness, alcohol, travel, exercise, or factors the user cannot see.
A wearable also cannot independently determine whether someone has chronic insomnia, obstructive sleep apnea, a circadian rhythm disorder, narcolepsy, restless legs syndrome, or another condition.
The best use of wearable data is often pattern recognition:
- What changed?
- Is the pattern repeated?
- Does it match how the person feels and functions?
- Is the measurement helping with a decision?
- Would another form of assessment answer the question better?
More tracking is not always better. If a nightly score increases anxiety, drives repeated checking, or makes someone distrust how they feel, reducing attention to the score may be clinically useful.
Bring concerning trends to an appropriate healthcare professional rather than trying to diagnose the problem from the device alone.
What to do next
Explore Sleep & Change resources about sleep data, wearables, and digital health.
Related resources
- Consulting
- Expertise
- Sleep Clinic
- Contact us about consulting
- Can Wearables Diagnose Sleep Disorders?
- What Your Sleep Tracker Can and Cannot Tell You
- Understanding HRV and Sleep
References
- Khosla S, Deak MC, Gault D, et al. Consumer sleep technology: an American Academy of Sleep Medicine position statement. View source (opens in a new tab)
- Khosla S, Deak MC, Gault D, et al. Consumer sleep technology: accuracy and impact on behavior among healthy individuals. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Behavior changeSelected by Dr. Mason
Why does knowing what to do rarely make behavior change easy?
Information answers “what should I do?” Behavior change also requires us to ask whether the action feels relevant, possible, chosen, supported, repeatable, and realistic within the person’s environment.
Open this answer on its own pagePeople are often told what to do as if information were the missing ingredient.
Sometimes it is. More often, a person already knows the recommendation and is struggling with something else:
- They are not convinced the change will matter
- The benefits feel distant
- The immediate cost feels too high
- The plan conflicts with work, caregiving, symptoms, or relationships
- They do not feel confident performing the behavior
- The environment repeatedly disrupts it
- The goal feels imposed rather than chosen
- They have not yet developed the necessary skill
- The plan works only under ideal conditions
- Early attempts did not produce the expected result
This is why behavior should not be treated as a character test.
A useful intervention looks more closely at the mechanism limiting progress. Depending on the situation, the next step may be to:
- Increase relevance
- Explore ambivalence
- Offer meaningful choices
- Connect the behavior to a personally important outcome
- Make the first step smaller
- Build the missing skill
- Change the environment
- Add support or feedback
- Prepare for predictable disruptions
- Reconsider a plan that does not fit real life
Motivation is also not simply present or absent. A person may feel pressured, conflicted, personally invested, or deeply connected to the reason for change. Those forms of motivation do not function in the same way.
The question is not only, “How do we make someone comply?” It is, “What would make this behavior understandable, possible, repeatable, and meaningful enough to continue?”
Theory helps us ask better questions. The intervention still has to work in the person’s actual life.
What to do next
Explore how Sleep & Change translates behavior-change science into clinical care, digital products, programs, and organizational strategy.
Related resources
References
- Deci EL, Ryan RM. The “what” and “why” of goal pursuits: human needs and the self-determination of behavior. View source (opens in a new tab)
- Michie S, van Stralen MM, West R. The Behaviour Change Wheel: a new method for characterising and designing behaviour change interventions. View source (opens in a new tab)
Author: Christine Mason, PhD, DBSM. Clinically reviewed October 20, 2026.
This answer is provided for general education. It does not diagnose or treat a health condition, provide individualized medical advice, or establish a professional relationship. Seek appropriate professional care for persistent, concerning, or urgent symptoms.
Questions from the community
Selected questions are answered for general education and may be edited to protect privacy or make the topic useful to a broader audience.
Answers are being developed. Have a question you would like us to consider?
Article Library
Full reference articles
20 articles
- Circadian RhythmWhat Are Zeitgebers?Zeitgebers are environmental time cues that entrain the circadian clock to the 24-hour day. Here is how each one works and which ones matter most.Read
- Circadian RhythmWhy Wake Time Matters for Circadian RhythmA consistent wake time anchors the circadian clock and builds sleep pressure for more reliable sleep at night. Here is why clinicians should target wake time first, and how to help patients set one.Read
- Circadian RhythmHow to Shift Your Sleep ScheduleA step-by-step, evidence-informed method for moving your sleep schedule earlier or later using light, timing, and gradual shifts.Read
- Circadian RhythmMorning Light and Circadian RhythmWhy morning light is the strongest lever for sleep timing, how much you need, and what to do in winter or when mornings are dark.Read
- Circadian RhythmSocial Jet LagSocial jet lag is the mismatch between your biological clock and your social schedule. Here is how it is measured and what it does to alertness and health.Read
- Insomnia & CBT-ICBT-I vs. Sleep HygieneSleep hygiene is general advice; CBT-I is a structured, multi-component treatment with strong evidence for chronic insomnia. Here is the difference.Read
- Insomnia & CBT-IHow Long Does CBT-I Take?Most courses of CBT-I run four to eight sessions over six to ten weeks. Here is what happens week by week and what affects the timeline.Read
- Insomnia & CBT-ICBT-I vs. Sleeping MedicationClinical guidelines recommend CBT-I as first-line treatment for chronic insomnia. Here is how it compares with hypnotics on speed, durability, and risk.Read
- Insomnia & CBT-IWhat Is Sleep Compression?Sleep compression gradually narrows time in bed toward actual sleep time, rather than cutting it in one step. Here is how it works and who it suits.Read
- Sleep ScienceWhat Does a Sleep Psychologist Do?A sleep psychologist assesses and treats sleep disorders without medication, including insomnia, circadian disorders, PAP difficulty, nightmares, and more. Here is the scope of practice.Read
- Insomnia & CBT-IHow to Find a Qualified CBT-I ProviderWhat credentials to look for, what questions to ask, and how to tell structured CBT-I from general talk therapy about sleep.Read
- Wearables & TechnologyWhat Your Sleep Tracker Can and Cannot Tell YouConsumer wearables estimate sleep from movement and heart rate. Here is where the data is genuinely useful and where it misleads.Read
- Wearables & TechnologyCan Wearables Diagnose Sleep Disorders?Wearables can flag patterns worth investigating, but diagnosis of sleep disorders requires clinical evaluation. Here is the boundary and why it matters.Read
- Wearables & TechnologyOura vs. WHOOP vs. Apple Watch for SleepA clinician's framework for comparing consumer sleep wearables: what each measures, and which questions each can actually answer.Read
- Wearables & TechnologyUnderstanding HRV and SleepHeart rate variability reflects the autonomic state of the nervous system. Here is what HRV can indicate, and how to avoid over-reading it.Read
- Behavior ChangeSleep and Behavior ChangeMost sleep advice fails at the intervention layer, not the knowledge layer. Here is what health psychology says about making sleep changes stick.Read
- Circadian RhythmCircadian Rhythm and Jet LagJet lag is circadian misalignment, not just tiredness. Here is how direction of travel, light timing, and pre-adaptation change the recovery trajectory.Read
- Children & FamiliesPreparing Children's Sleep Schedules for SchoolHow to move a child's or adolescent's summer sleep schedule back toward school hours, using gradual shifts, light, and predictable routine.Read
- PerformanceSleep and PerformanceSleep affects reaction time, accuracy, learning, injury risk, and recovery. Here is what athletes and performance staff should prioritize.Read
- Women's SleepWomen's Sleep Across the LifespanHormonal transitions, caregiving, and higher insomnia prevalence shape women's sleep from menarche through post-menopause. Here is what changes and when.Read