Expose yourself to intense light (natural outdoor light for 15 to 30 minutes or a 10,000 lux light therapy lamp) within the first half-hour after waking up to synchronize your internal clock.

noli's read

A 2026 study from the University of Manchester shows that regular exposure to intense light during the day is directly linked to an earlier bedtime and deeper sleep. This advice is based on very solid circadian biology principles, confirmed by multiple clinical trials and scientific reviews (such as those synthesized by Stanford Health Care) demonstrating that morning light effectively realigns the internal clock. This early light stimulation signals the body to stop sleep signals to promote alertness and daytime vitality. The alternative of a 10,000 lux lamp is also validated by numerous meta-analyses on the use of light therapy. The strict window of the 'first half-hour' is, however, a bit rigid: observational studies indicate that exposure before 10 a.m. already offers immense benefits. Finally, in overcast weather, 15 minutes outdoors sometimes proves insufficient to capture the necessary intensity, and it is therefore recommended to extend the session to 30 or 45 minutes.

the sources

1. 1Garolla A, Torino M, Sartini B, et al. 2013
2. 2Gundersen TD, Jørgensen N, Andersson AM, et al. 2015
3. 3Blueprint Protocol (protocol.bryanjohnson.com, CC BY-NC)