how much sleep do we need?we are all differant.A baby needs 16 hours of sleep every day.Children 6to12years old need an average of 10to12hours of sleep.teengers need 9 to 10 hours of sleep.An adult need only 3hours of sleep.Others need 10hours of sleep.After the age of 50, that average sleep time goes down to6.5houts anight.we need less sleep as we get older