Enter a clue or pattern or both:
The Clue
Tendency to deep sleep (10 letter answer)
The Answer
NARCOLEPSY
Tags
Notes
The answer NARCOLEPSY is so rare that it appears less than once every 2500 puzzles.
Definition
NARCOLEPSY as a noun:
1. a sleep disorder characterized by sudden and uncontrollable episodes of deep sleep; "he believes that narcolepsy is attributable to an inability to suppress REM sleep during waking"