From Larry Stoter, The Narth, Monmouthshire, UK
When it comes to body clocks, researchers should investigate the phenomenon of “second sleep”, or biphasic sleep. This is fairly well-known historically and among some anthropologists. It seems to have been relatively common and widespread at a time when people’s daily rhythms were largely determined by the sun and when bright indoor lighting was unavailable for most people(2 August, p 30).
Typically, people would go to sleep perhaps 2 hours after sunset, sleep for a few hours, wake for a period, then sleep again until early morning.
Perhaps a more relaxed attitude to sleep and a return to biphasic sleeping would lessen the incidence of sleep disorders.
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