[tmd]

I have always suspected that I need more sleep than other people. When I tried to live without alarm clock I slept for 9-10 hours every night. It seems to be an enormous waste of time so I usually schedule an alarm after 8 hours.

It never occurred to me that one can measure whether the amount of sleep received is right. I just downloaded PEBL (http://pebl.sourceforge.net/), an open source software that includes the P.V.T. test (mentioned in the article) in its battery -- an you can adjust lots of test parameters simply by editing ppbt.pbl. Seems to be working fine (though the test itself is boring and tedious). I'll measure few times a day and try whether 8 vs 10 hours makes a difference in my case.