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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.
Well... an average adult sleeps an average of 8 hours per night, multiply that by 365 days and you get 2920 hours a year. A child would be an aver age of 10 hours per night, a â¦ nd therefore, 3650 hours a year! + 30 others found this useful.pproximately one third of the years of your lifetime. (If you live fof 60 yeears, 20 years would be spent sleeping. If you lived 90 years, 30 of them would be spent sleeping.).