Like a bouncer one shouldn't hit, being in bed (3,2)

I believe the answer is:

not up

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

'being in bed' is the definition.
(not awake yet)

I don't understand the rest of the clue.

(Other definitions for not up that I've seen before include "still in bed" , "with tennis call" , "call in court" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app