Refreshed as sleep passes away (7)

I believe the answer is:

elapses

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'passes away' is the definition.
'elapses' can be an answer for 'passes' ('elapse' can be a synonym of 'pass'). I'm not sure about the 'away' bit.

'refreshed as sleep' is the wordplay.
'refreshed' is an anagram indicator.
'as'+'sleep'='assleep'
'assleep' anagrammed gives 'ELAPSES'.

Can you help me to learn more?

(Other definitions for elapses that I've seen before include "Passes (in time)" , "Slips away" .)

I've seen this clue in The Globe and Mail.

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