Morning bright-light exposure

BGood evidence

Getting bright light early anchors your circadian clock, improving sleep and daytime alertness.

Grade B — Good evidence

What it does

Morning light advances the circadian phase, which improves nighttime sleep quality and next-day alertness — an indirect but reliable cognitive lever.

10–30 min of outdoor light within ~1 h of waking. On dark mornings, a 10,000-lux lamp works.

It's a sleep/circadian intervention, not a stimulant. Effects compound over weeks.

Blume C, Garbazza C, Spitschan M. Effects of light on human circadian rhythms, sleep and mood. Somnologie.

2019 · Narrative review of light/circadian RCTs and field studies

Timed bright light reliably shifts circadian phase and improves sleep timing and alertness.

Effect: Phase shifts of 1–2 h achievable; consistent across the literature.

Should this be in your routine?

Ask the coach — it'll tailor doses to your sleep, goals and current stack.