Sleeper's woe (5)
I believe the answer is:
apnea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sleeper's woe</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 apnea that I've seen before include "that'll make you catch your breath?" , "Cessation of breathing during sleep (US spelling)" , "stopping breathing in US" , "Loss of breath" .)