My son sweats very heavily during the first 2 - 4 hours of sleep at night (enough to drench the bed), or even when napping. He stops sweating later in the early morning hours, and his body is usually cool and dry. During the day he runs and plays, eats well, and doesn't seem to show any other adverse symptoms. He was born prematurely (26 weeks), and did have a level 4 brain bleed at about 3 weeks of age, but so far has been blessed with normal physical movement and no signs of cerebral palsy, even though the docs thought he would show signs of it - at least dragging a leg or arm. He plays baseball and basketball and has great fine and gross motor skills. He is 6 years old. We've had him tested for diabetes, and no signs of that either. Can sweating be caused by allergies? He does have allergies to dust mites, and I've wondered about food allergies.