He said he usually goes to sleep at about 3 a.m. and wakes up after about six hours at 9 a.m. or 9:30 a.m. Musk said he also had a "bad habit" of immediately checking his phone after he wakes up ...

My teenage son's sleep is all over the place. He goes to bed late most nights and then finds it difficult to get out of bed in the morning for school. The weekends are worse — he spends half ...