Yesterday afternoon,I had a very deep nap,from 2:00PM to 4:30PM.This was very comfortable,but was also the reason why I couldn't sleep until 2:00 this morning.And the tragedy for me was that I must get up at 5:30AM.So,I was in sleep for only 3 hours and 30 minutes.And I had three classes today.

Now,I am so tired and I will have a lot of assignments to do.So maybe I should learn how to face exhaustion.