For some reason, I wasn't in a good condition.
Yuki : www~ my headache ackes~!!
Nyankichi sensei : Ummm your English is wrong..
Then I went to bed 0am, and woke up 9am, then went to bed again 10am and woke up 12pm. Again, I took long nap at 5pm to 10pm and slpet at 2am. Next morning, I woke up 9am without headache!