Today I woke up at 5:00AM because some Couchsurfers were leaving early to take a plane in Narita. Actually, I don’t mind it at all. I read some news on the net, put the trash out, and then after 1 hour went back to sleep.

When I went back to sleep, however, I actually started thinking about Sleeping. Sleeping is a fascinating function of most higher animals that we still don’t understand fully – what exactly is its function, how much sleep do we need, how it works. The second question in particular was grabbing my mind at the time.

How much sleep do we need? The common answer is about 8 hours of sleep per night for an adult. Some people live on 6 hours sleep routines (I did for a while). Yesterday, I went to bed around 1 in the morning, and, having woken up at 5, that puts me at 4 hours. Since I had no reason to stay awake, I decided to “fill my quota”, by sleeping another 2 or 3 hours before waking up for good.

But is it okay if we sleep 4 hours, stay awake 2, and then sleep another four? What about 4 hours sleeping, 4 awake, 4 sleep? What about breaking it in small intervals? Or one big 6 hour interval and three 1 hour intervals? I was thinking about that. I remembered a story about a famous scientist (was it Newton? or DaVinci?) who was said to live in a “sleep one hour, stay 3 awake” schedule (XKCD has a different suggestion). At these times I wish I had been a neurologist…

Eventually I went back to sleep, but now with the late spring sun rising early in the morning, I was up again by eight. Well, all the better for me to get to work, but now I must start taking care not to sleep too late if I want a full night of rest before the sun wakes me up :-)