Best thing to do for the rest of the night (5)

I believe the answer is:

sleep

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'rest of the night' is the definition.
'sleep' can be an answer for 'rest' (synonyms). I'm not sure about the 'of the night' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sleep that I've seen before include "Drop off" , "''... that knits up the ravell'd sleeve of care'' (Macbeth)" , "crash" , "Wayne _; former Royal Ballet principal dancer" , "Produced (egg)" .)

I've seen this clue in the Evening Standard.

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