Please boss out for the night (6)

I believe the answer is:

asleep

I'm a little stuck... Click here to teach me more about this clue!

'out for the night' is the definition.
(I've seen this in another clue)

'please boss' is the wordplay.
'please' anagrams to 'ASLEEP'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for asleep that I've seen before include "Resting unconscious" , "Slumbering" , "In the Land of Nod" , "Please be at rest (6)." , "Dormant; inattentive" .)

I've seen this clue in The Irish Times.

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