You'll fret if you lose it (5)
I believe the answer is:
sleep
(Other definitions for sleep that I've seen before include "Drop off" , "Natural state of unconscious rest" , "Shut-eye" , "Slumber" , "crash" .)
I believe the answer is:
sleep
(Other definitions for sleep that I've seen before include "Drop off" , "Natural state of unconscious rest" , "Shut-eye" , "Slumber" , "crash" .)