The myth of the 25-hour dayEarly investigators determined the human circadian period to be 25 hours or more.
They went to great lengths to shield subjects from time cues and daylight, but they were not aware of the effects of indoor electric lights.
The subjects were allowed to turn on light when they were awake and to turn it off when they wanted to sleep.
Electric light in the evening delayed their circadian phase.
These results became well known.
(They went to great lengths to shield subjects from time cues and daylight, but they were not aware of the effects of indoor electric lights.
The subjects were allowed to turn on light when they were awake and to turn it off when they wanted to sleep.
Electric light in the evening delayed their circadian phase.
These results became well known.
gronkpan @vomitinglarry.bsky.social,
Mon 19 Jan 2009, 10:29,
archived)