Crossword Genius

What goes on in bed repels me, unfortunately (3,5)

Ross

I believe the answer is:

rem sleep

'what goes on in bed' is the definition.
(REM sleep is a phase of sleep)

'repels me unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters.
'repels'+'me'='repelsme'
'repelsme' is an anagram of 'REM SLEEP'.

I've seen this clue in The Guardian.
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