I've recently read an article suggesting that this pattern, two ~4 hour sleeps with a wake active phase in the middle, is closer to the natural sleeping pattern for humans than the ~8 hours in one stretch that we've apparently only used for the last couple of hundred years.
Originally Posted by Tog
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain