yes it is normal
It is if you're not getting enough sleep - teens and kids need 10 hours of sleep a night!
They should sleep about 8 or 9 hours a night.
10-11 hours every night are the optimum hours of sleep an eight-year-old should get.
A fourteen year old should get nine hours of sleep each night.
A 5 year old should sleep around 10 to 11 hours and adults should sleep around 7-8 hours.
at least 8 hours sleep every night
A 17 year old man should have about 7.5-8 hours of sleep each night.
8 hours a night
Eight or nine hours each night.
A nine-year-old should have about 9-11 hours sleep each night.
A 12 year old should have 8 to 9 hours of sleep each night. Sleeping to little or to much is unhealthy, especially when you are maturing.
They should usually have around 9 to 9 + a half hours sleep per night.