When I lie down on the bed, I can think about nothing but sleep as long as I can. I wouldn't choose to study, walk around, go shopping or play my drum, just like that I would never wake up. Several days later, I had a heavy headache. When my neck touches the pillow, I feel very uncomfortable.<div>I envy people who can sleep well with his neck on the leaves. It's said that people who are extremely tired can fall asleep even when they lie in stones. Seemingly, college students enjoy much length of our sleep. However, we should have struggled for our study.</div><div>So, now I'm in the library, and my headache's gone.</div>