Thread: Does it matter when I do my sleeping?

Hello everyone.

I have a couple of questions concerning my sleeping habits. I love to stay up late and sleep 'till noon, usually I sleep from 2-3 am to 11-13 am. But even though I get enough sleep (at least 8 hours!), I feel drowsy and am unable to concentrate much. This is bad because my Finnish A-levels are coming in two months and studying is almost impossible, due to my concentration problems and the fact that I tend to lose my will to do any work.

The odd thing is that I could run a marathon any time I wanted. My physical fitness doesn't suffer at all, but my main concerns are my mental abilities. I forget things and my friends compare me to a zombie, but I've noticed that I can think normally if I get no interference from the outside world and don't have to interact with it. Mind-blowing, isn't it?

So, does it matter _when_ one sleeps if that person has already been sleeping like it for two or three months? I normally sleep from 12 pm to 7 am schooldays, but it's holidays now and I don't have to worry about school. And if it doesn't matter when you sleep, could my problem be that I sleep very lightly in the mornings because my parents wake up usually around 9 am and the morning sun shines through my windows at sunrise?

edit. oh yeah, and the reason I don't go to sleep early (like 11 pm) due to my drowsiness is that my energy levels rise very high during the day. I feel tired from, let's say, 1 pm to 6 pm, but when the night comes, everything just cleares and I feel just fine. And with that amount of energy, I can easily stay up late and face the consequences in the morning, again.