As far as I know, I am pretty sure that pre teens and teens need about 10-12 hours every night.
1 hour and 30 minutes
12 year old girl needs only 8 hour uninterupted sleep good luck
4 hours
i think that astronauts usually get about six hours of sleep every night when they are in space.
They should sleep about 8 or 9 hours a night.
They can sleep for a couple of hours in the day and 12 hours at night.
At least 8 hours of sleep.
Less than 8 hours.
A 14 year old girl should get ad least an 8 hour sleep. If you sleep to little you can get very unhealthy and be kinda grouchy. If you get to much sleep then theres a possibility you can dose off and go into a coma. Keep that 8 hours. Or you can go for 8 hours and 30 minutes. :)
Well I am a girl and my science teacher said 8 to 10 hours the more the better!;)
Well about 9 or 10 hours a night.
Ostriches sleep sitting down, at dark, and sleep off and on through out the night.
Ages 13-18 need about 8 to 10 hours of sleep. Adults between 25 and 64 years of age need an average of 7 to 9 hours of sleep per night. Adults 65 and older need 7 to 8 hours per night.