Have a nap (4)
(Other definitions for sleep that I've seen before include "Slumber" , "Wayne _; former Royal Ballet principal dancer" , "Be dormant" , "''... that knits up the ravell'd sleeve of care'' (Macbeth)" , "Natural state of unconscious rest" .)
(Other definitions for rest that I've seen before include "Remainder; relax" , "Freedom from activity" , "Take it easy, have a break" , "Leisure" , "Balance" .)