How do I reset my circadian rhythm?

A disrupted circadian rhythm — from jet lag, shift work, inconsistent schedules, or chronic late nights — can be reset in 3-7 days using the same signals (zeitgebers) that synchronize your internal clock to the 24-hour day.

The 7-Day Reset Protocol

### Day 1-2: Anchor your wake time Choose your target wake time and commit to it regardless of when you fell asleep. This is the single most important step. Even if you only slept 4 hours, get up. Sleep pressure will build, making the following night easier.

### Day 1-7: Morning light exposure Within 30 minutes of waking, get 10-30 minutes of bright light: - Best: Direct sunlight outdoors (even overcast = 10,000+ lux) - Good: Light therapy lamp (10,000 lux, at arm's length) - Insufficient: Indoor lighting (typically 100-500 lux)

This suppresses residual melatonin and tells your master clock (SCN) that "day has started."

### Day 1-7: Meal timing Eat breakfast within 60 minutes of waking. This synchronizes peripheral clocks in your liver, pancreas, and gut. Stop eating 3 hours before target bedtime — late eating delays your clock.

### Day 1-7: Evening light restriction Start dimming your environment 90 minutes before target bedtime: - Switch to warm, dim lighting (under 50 lux) - Use night mode on devices or avoid screens entirely - Wear blue-light blocking glasses if screens are unavoidable

### Day 3-7: Exercise timing Morning exercise (especially outdoors) reinforces the advance signal from light. Avoid intense exercise within 3 hours of bedtime — it raises core body temperature and delays sleep onset.

Specific Scenarios

### Jet lag (eastbound — harder) Shift 1 hour earlier per day starting 3 days before travel. Use morning light at destination. Melatonin (0.5-3mg) 5 hours before destination bedtime can accelerate the shift.

### Jet lag (westbound — easier) Stay awake until local bedtime on arrival. Evening light exposure helps delay your clock to match the new zone. Most people adjust at ~1.5 hours/day westbound vs ~1 hour/day eastbound.

### "Broken" sleep schedule (sleeping 3-5 AM) Do NOT try to shift gradually. Use one night of mild sleep deprivation: stay awake until your target bedtime (e.g., 11 PM), then wake at your target time regardless. The accumulated sleep pressure resets your rhythm faster than gradual shifting.

### Shift work Full reset isn't always possible. Instead: keep a consistent schedule even on off-days, use blackout curtains for daytime sleep, and get bright light at the start of your shift. Consider your shift pattern permanent and optimize around it.

What NOT to Do

• →Don't nap after 3 PM — it relieves sleep pressure and delays bedtime
• →Don't use alcohol as a sleep aid — it fragments sleep architecture
• →Don't stay in bed tossing — after 20 minutes awake, get up and do something boring in dim light until sleepy
• →Don't change wake time on weekends — even 1 hour of "social jet lag" can undo weekday progress

Timeline Expectations

• →Mild disruption (1-2 hours off): 2-3 days
• →Moderate disruption (3-5 hours off, jet lag): 4-7 days
• →Severe disruption (inverted schedule): 7-14 days
• →Chronic disruption (years of shift work): 2-4 weeks for full stabilization

Supplements That Help

• →Melatonin (0.5-3mg): Take 5 hours before target bedtime to advance the clock. Lower doses (0.5mg) are often more effective than high doses.
• →Magnesium glycinate (200-400mg): Supports sleep onset without shifting the clock.
• →Note: Supplements support but cannot replace light/timing interventions.