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At 3, most children are still napping, while at 5, most are not. Naps gradually become shorter as well. New sleep problems do not usually develop after 3 years of age. 7-12 Years Old: 10 - 11 hours per day.At these ages, with social, school, and family activities, bedtimes gradually become later and later, with most 12-years-olds going to bed at about 9 p.m.There is still a wide range of bedtimes, from 7:30 to 10 p.m., as well as total sleep times, from 9 to 12 hours, although the average is only about 9 hours.12-18 Years Old: 8 - 9 hours per day.t 3, most children are still napping, while at 5, most are not. Naps gradually become shorter as well. New sleep problems do not usually develop after 3 years of age. 7-12 Years Old: 10 - 11 hours per day.
But for those effects, you have to wait years to say: I told you so.. This latest study found that short-term effects, such as colds, flu and gastroenteritis, were more frequent when teenagers had less sleep. The study followed 56 teenagers aged between 14 and 19 for three months. They wore actigraphs on their wrists that measured movement (and therefore sleep) and were regularly interviewed about illnesses and absences from school. Those who slept for fewer than seven hours a night had more sickness. The lead author, Kathryn Orzech, says research shows that teenagers need 9.5 hours sleep a night, but on average get only 7.5 hours. But this doesn't mean that it is normal for teenagers not to get enough sleep, says Orzech.