It is best to reach an agreement with all members of the dormitory from the beginning:

(1) It is best to sleep at 23:00-23:30 at night-it is best to sleep at 07:00-07:30 in the morning;

(2) At noon 13: 00 to 14: 00.

Reason: Scientific research shows that it is best for ordinary people to take a lunch break every day and sleep for no more than 8 hours and no less than 6 hours every day.