Final answer:
Victor takes opium to sleep after his fever until death, leading to vivid and emotional dreams or nightmares as a result of the narcotic's influence, as described in literary references.
Step-by-step explanation:
The appears to involve a literary analysis of characters' dreams and their narcotic-induced experiences, which is a theme found in literature. In the given excerpts, individuals are seen grappling with the effects of opium and delirium, which lead to vivid dreams or nightmares. For instance, one reference mentions an after-dream of the reveller upon opium, which implies a harsh return to reality after the narcotic effects wear off. Another snippet illustrates a person having nightmares after a guilt-inducing event, similar to Macbeth who claims 'Sleep no more! Macbeth does murder sleep'. Repetition in the narrative of falling asleep due to exhaustion and experiencing dreams provides a look into the struggles and mental states of the characters. Dreams of fantastical landscapes and emotional expressions arise from the use of opium, according to another passage. Therefore, the closest answer to the question based on the given references would be that Victor takes opium to sleep after his fever until death and he dreams of emotionally significant spectacles and scenes, which are sometimes nightmarish.