Ready for bed (6)
I believe the answer is:
sleepy
'ready for bed' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sleepy that I've seen before include "One of the Seven Dwarfs" , "Drowsy; indolent" , "Doc's nodding pal" , "Soporific" , "Rather tired" .)