Top Definition
When that new mattress feels like a cloud and you want to sleep all the time.

Origin: In Malcolm in the Middle (Season 7, 146-17), Malcolm and Dewey find a new mattress. Malcolm proceeds to sleep infinitely on the mattress, thus, Malcolm experiences the new mattress effect.
Bob: When I got my new mattress I put myself on mandatory bed rest to enjoy the supremacy over my old one.

Joe: That's the new mattress effect, I've had it too.

Tim: I've slept for three days on my new mattress, I can't tell if it's draining my soul or helping it.

Bob: I'm going through the same thing, it's the new mattress effect.
by Allen75 June 14, 2010
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