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One who 'suffers' frequently from bouts of sleep sex or, sexsomnia.
Jill: Jeez, I'm so sore after last night.
Sophie: What happened?
Jill: Well, Greg is a real sexsomniac, and was a little rough.
Sophie: God that must be horrible!
Jill: Not really, I sleep really well afterwards.
by Invius December 09, 2007