My wife and I started biphasic sleeping naturally a few years back, our first sleep is around 3 hours followed by another 4-5 hours. www.bbc.co.uk/future/artic...
bbc.co.uk
The forgotten medieval habit of 'two sleeps'
For millennia, people slept in two shifts – once in the evening, and once in the morning. But why? And how did the habit disappear?
