It's 3 a.m. and you should be sleeping. But you aren't. Maybe you're a night owl or maybe you have a crying baby. Whatever the reason, you're wide awake, probably counting the time until your alarm goes off.

It's 3 a.m. and you should be sleeping. But you aren't. Maybe you're a night owl or maybe you have a crying baby. Whatever the reason, you're wide awake, probably counting...