I don’t remember getting much sleep in it (3)
I believe the answer is:
cot
'i don't remember' is the definition.
I can't judge whether this definition defines the answer.
'much sleep in it' is the wordplay.
'much sleep in' becomes 'co' (I can't justify this - if you can you should believe this answer much more).
'it' becomes 't' (abbreviation. e.g. in 'tis).
'co'+'t'='COT'
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for cot that I've seen before include "Camp bed" , "Function" , "Crib" , "Small bed with high sides" , "Folding bed - fingerstall" .)