Sleep deprivation effects begin faster than you think, harming your heart, hormones. Here's the facts, from medical experts.

Your bedtime could be affecting the number on the scale.

Suppose that your fifth-grader typically goes to bed at 9:30 PM on school nights and gets up at 6:30 AM. Since it often takes a little while to fall asleep after getting into bed, that means 8.5 to ...