The correct option is D Stupor
A stupor is a state of near-unconsciousness or insensibility, that is, a heavy slumber. For example, "a drunken stupor". Hence, Option D is correct. Among the rest of the options, nap means short sleep, especially during the day, insomnia means habitual sleeplessness, coma means a prolonged state of deep unconsciousness, caused especially by severe injury or illness. These options do not express the intended meaning, hence incorrect.