Bi-modal Sleep Patterns

Bi-modal Sleep Patterns

There's an interesting article on the BBC News site about bi-modal sleep patterns - basically says that waking at night for a couple of hours and then sleeping again is probably how we used to sleep before the focus on 8 hours' sleep a night became widespread. Over the past couple of years, I've drifted into this First Sleep and Second Sleep pattern. Any others out there?

BBC News - The myth of the eight-hour sleep
Sorry that link may not work so please try this one.

http://www.bbc.co.uk/news/magazine-16964783
I usually fit into a 2 sleep pattern, although not normally 4 hours. I had never heard of this before.
Thought this was very interesting and positive,