You are not old enough.

来源: 于 2012-12-19 16:53:02 [旧帖] [给我悄悄话] 本文已被阅读：次

When I was 20 something, I can sleep 12 hr a day (that's why I missed most morning classes when I was in college); now I can sleep only 6 hr. I will wake up after 6 hr sleep, if I force myself on bed, my back hurts.

You are too young to complain.