As a baby, my son, Darren, perspired while he slept. A lot. If he fell asleep in the car, I would sometimes pull over to dab at the moisture along his hairline. At first, I blamed the heat and humidity -- but he'd wake up with wet hair even in his air-conditioned bedroom.
Fearing the worst, I took him to the doctor. Turns out, the perspiration wasn't a big deal, since many infants sweat while they sleep. Babies have lots of other bizarre bedtime behaviors that can unnerve you. To ease your mind, we talked to experts about when the habits are harmless.