Semiconscious state (6)
I believe the answer is:
stupor
'semiconscious state' is the definition.
(I know this)
This is all the clue.
(Other definitions for stupor that I've seen before include "State of near unconsciousness" , "Dazed, unconscious, state" , "Mental torpor" , "State of dazedness or bemusement" , "that'll send you to sleep" .)