Why so tired?

The recent two days' evening, I was not in lab. Instead I was in the classroom of Building A.

But when I had read for about half an hour, I was very sleepy. I must have a snap nearly for about an hour. And after I awaked, I felt some tired. After a face-wash, I could go on my studying.

Today I found some information about health, bite and sup, rest, and taking exercise. It was bad to be front of computer for two hours without any rest. Maybe I had adapted to be front of computer in evening. When I was studying in classroom in evening, I would feel tired.

Maybe, the basis reson was there was not enough exercise to me these days.