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1.
when, upon waking, one finds one's self laying in wet sheets, either due to fever, drunkenness, or overly high bedroom temperature while sleeping.
I swear it was 100 degrees in my room last night; when I woke up I had sweat the bed.

Mike got so drunk last night that he thought he pissed himself, but he had just sweat the bed.
by waterbrother July 30, 2009
 
2.
When you are asleep and you sweat so much your bed gets wet from it.
I awoke in the middle of the hot summer night to a wet feeling on my bed and was covered in sweat. I sweat the bed.
by Loner stoner August 04, 2014