>I've come down to pretty stable 8 hours. Occasionally, it happens that I sleep just 6, 5 or even 3 hours - which I then make up by sleeping 15 minutes in the afternoon. I don't really know how I do it, but this power nap does work for me.

I can't nap. First of all I find it almost impossible to wind down so that I can fall asleep. If I fall asleep, I get all sweaty and often get a stomach ache. Plus I find it really hard to get up again. For instance if I was to somehow take a nap at 4pm, I wouldn't get up until the morning. Instead of feel refreshed I will fell dizzy and tired for the rest of the day.

> It's usually on the carpet, with just a minimal pillow, and I sink deep within a minute.

I used to do that as a kid. I should try it. I hope you don't do that at work. Could be seen as eccentric.

> In the evening, it usually takes me much longer to get asleep.

If all systems are go I fall asleep pretty quickly at night. I generally try not to go to bed unless I feel tired, but fortunately that is generally at the same time every night.

>I have a different problem. My day seems to have 25 hours. When I don't pay attention (don't ask how much), I tend to go to bed one hour later every day. Then I usually have to break out of it, usually when I come close to 3am mark, by forcing myself to wake up early, be slightly dizzy for a day, and then be sort of normal for a while.

I think lizards have this 25 hour day. It might explain your name.