How to Shift Your Sleep Schedule

Shifting a sleep schedule is a circadian task, not a discipline task. The clock moves at a limited rate — roughly 30 to 60 minutes per day when cues are arranged well — and it moves in response to light and timing, not to earlier bedtimes alone.

To move earlier (advance)

1. Move wake time earlier by 15 to 30 minutes per day, not all at once.
2. Get bright outdoor light within the first 30 to 60 minutes after the new wake time.
3. Dim indoor light and screens in the 2 hours before the target bedtime.
4. Keep bedtime driven by sleepiness at first; it follows the advancing wake time within days.
5. If melatonin is used, low doses in the early evening are typically timed several hours before target sleep onset — discuss timing and appropriateness with a clinician.

To move later (delay)

Delays are easier because the intrinsic clock already runs long. Push wake time and light exposure later in steps, keep evening light bright, and avoid morning light during the transition — this is the logic behind pre-adapting to westward travel or to a new shift rotation.

Common reasons a shift fails

• Trying to move more than an hour a day.
• Getting the new bedtime right but leaving the wake time variable.
• Dark mornings and bright evenings, which push the clock the wrong direction.
• Weekend reversion, which undoes several days of progress in one night.