Peter Attia· MD
they basically took a bunch of guys in the military highly sleep-deprived and then put them in an environment where they were forced to be in darkness for some period of time I want to say it was like I think it was like ten hours a day or something like that and the idea was or maybe it was 12 hours of pure darkness 12 hours of light but with no sense of time I don't think they had access to any clock and within two weeks they were all basically sleeping something like seven and a half to nine hours and night even though they hadn't been sleeping close to that in the past