Get daylight during your waking day
Daylight helps align your body clock with the time you want to be awake.
The number, drawn
Morning light shifts the body clock toward earlier sleep timing
Why it matters
Light is a signal that sets your internal clock and supports alertness. For people who sleep at night, morning light tends to move sleep timing earlier, while bright evening light tends to move it later. There is no universal number of outdoor minutes shown to improve longevity.
How to do it
- If you sleep at night, include some outdoor light after waking when practical.
- Add an outdoor break during daylight hours.
- Fit this around your intended sleep schedule rather than following a fixed clock time.
If you work nights or have a diagnosed circadian rhythm disorder, seek advice on timing light around your sleep.
Do it
Pick the time you have. Anything beats nothing.
Start with the time you have
1 minute
Choose a daylight break in your waking day; if you work nights, plan it around intended sleep rather than a fixed morning rule.
5 minutes
If it is daytime and you sleep at night, step outside for five minutes in daylight.
15 minutes
Spend a daylight break outdoors, seated or moving comfortably, if it fits your sleep schedule and conditions are suitable; ordinary outdoor time is the aim.
A plan
Fit daylight around your sleep
- Stage 1: Identify your intended sleeping and waking hours.
- Stage 2: If you sleep at night, fit an outdoor opportunity into the morning or another daylight break.
- Stage 3: Repeat a practical routine without chasing a fixed minute target.
- Stage 4: Get timing advice if night shifts or a circadian rhythm disorder make the usual pattern unsuitable.
In real life
- If you sleep at night, take part of your morning break outdoors when practical.
- Sit outside during a daylight break if walking does not suit you.
Watch out for
- Common mistakeFollowing a fixed morning-light rule when you work nights can conflict with intended sleep, so seek advice about timing.
- Common mistakeKeeping bright light until late in the evening pushes sleep later, so get your outdoor light earlier in the day.
Trusted guides
Check usSources
- Evidence grade
- B Consistent large cohort studies, with some trial evidence.
- Basis
- NIOSH circadian physiology guidance and NIH healthy sleep recommendations
- The number
- Morning light shifts the body clock toward earlier sleep timing (CDC NIOSH, 2020)
- Tier 1 guidelineEffects of Light on Circadian RhythmsCDC NIOSH, 2020
- Tier 1 guidelineSleep Deprivation and Deficiency: Healthy Sleep HabitsNHLBI, NIH, 2022
General health information, not a diagnosis or an individual treatment plan. Personalization changes the order of suggestions; it does not assess your medical risks. Follow the cautions and consult a qualified clinician when needed.