Deep sleeps (5)
I believe the answer is:
comas
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">deep sleeps</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for comas that I've seen before include "States of deep unconsciousness" , "State of deep and often prolonged unconsciousness" .)