My little boy's sweat smells like urine?

My son is only 3. He has a bath every night before bedtime, and he sweats like crazy while he sleeps. (No he isn't covered too much, he sweats even when it's cold.) One night I was positive he had wet the bed because I smelled pee so strongly when I went into his room, but it turned out to be his sweat!... show more My son is only 3. He has a bath every night before bedtime, and he sweats like crazy while he sleeps. (No he isn't covered too much, he sweats even when it's cold.) One night I was positive he had wet the bed because I smelled pee so strongly when I went into his room, but it turned out to be his sweat! What could be causing this? He does have a fairly balanced diet and is otherwsie healthy.
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