A heavy unnatural slumber

A. Nap

B. Insomnia

C. Coma

D. Stupor

Answer: Option D

Solution(By Examveda Team)

One word substitute is Stupor.

Nap: sleep lightly or briefly, especially during the day.
Insomnia: habitual sleeplessness; inability to sleep.
Coma: a prolonged state of deep unconsciousness, caused especially by severe injury or illness.
Stupor: a state of near-unconsciousness or insensibility.