One who sleeps frequently and is able to accumulate excess hours of sleep above beyond the mean. Sleep sluts are able to fall asleep indiscriminately and value sleep above all else.
Within minutes of boarding the commuter train Mark was fast asleep. Marks sleep slut powers were legendary in that he was always able to wake before his stop.
An anarchic villain is a villain who doesn't possess a specific goal in mind and their respective objectives are simply to cause chaos and disorder.
The Joker is an anarchic villain as he has no specific goals other than bringing forth chaos and disorder to Gotham City and Batman.