It could improve your mood to snore in turns (9)

I believe the answer is:

serotonin

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'it could improve your mood' is the definition.
The definition suggests a singular noun which matches the answer.

'to snore in turns' is the wordplay.
'turns' indicates an anagram.
'to'+'snore'+'in'='tosnorein'
'tosnorein' anagrammed gives 'SEROTONIN'.

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(Other definitions for serotonin that I've seen before include "Compound in brain" , "Neurotransmitter hormone, involved in depression say" , "Compound acting as a neurotransmitter" , "Compound present in serum - ironstone (anag)" , "Neurotransmitter compound; soon inert (anag.)" .)

I've seen this clue in The Independent.

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