Answer:
d. sleep rebound
Step-by-step explanation:
Sleep rebound: The term sleep rebound is also referred to as REM rebound and is defined as an increasing and lengthening depth and frequency of an individual's eye movement i.e, REM sleep that tends to occur or happen after a long period of an individual dealing with sleep deprivation. If an individual is being prevented from encountering REM sleep then there is a chance of taking less time to acquire REM state than usual.
In the question above, Hamid may be experiencing sleep rebound.