Lethargic, somnolent (6)
I believe the answer is:
drowsy
I believe this is a double definition.
'lethargic' is the first definition.
(I've seen this before)
'somnolent' is the second definition.
(I've seen this before)
(Other definitions for drowsy that I've seen before include "Soporific" , "Ready to sleep" , "Torpid" , "liable to drop off" , "Being rather tired" .)