Day 4

I slept 8 hours, and I did not take any nap. I feel alright.

Day 3

I slept 7:30, and I woke up without an alarm.

Free running sleep day 2

What I am doing is similar to what is described at this link http://www.supermemo.com/articles/sleep.htm#Free%20running%20sleep What I referred to as free sleep, should have been referred to as free running sleep.

Yesterday I had a nap at the library. I don't know how long it lasted because I did not check the time before I started the nap, but it is possible that it lasted over one hour. Last night I slept 8:30.