Ideas of sanity and insanity are both clear cut and obscure throughout Dracula. We have blatant forms of insanity – such as the clearly crazed Renfield – yet we also have other characters who exhibit more obscure signs of madness, such as Lucy and Jonathan. Lucy is put under constant surveillance, as she often sleepwalks throughout the night. Moreso, even when awake she can be found in a trance, as if enchanted by Dracula’s influence. When Lucy spots Dracula on her walk with Mina, she notes “‘his red eyes again! They are just the same’” (126). Mina reflects that Lucy went into a “half-dreamy state, with an odd look on her face” (126). Merely seeing Dracula is enough to cast Lucy into a daze. Somehow he manages to disturb the inner workings of the brain, perhaps in order to get his victims to do his biddings for him. Lucy, for example, is so entranced by Dracula that she leaves her bedroom in the freezing cold to meet him outside, where he consequently sucks her blood.
Similarly, Jonathan goes insane following his time spent with Dracula. While it may be fair to attribute his hospitalization to the disturbed, terror inducing torture he endured in Dracula’s abode, his severe reaction seems to suggest something more than that. After escaping Dracula’s castle, he is hospitalized for brain fever. It seems that Dracula inspires madness in his victims. The mere sight of him is enough to catapult an entire crew of men off of their own ship. Upon seeing Dracula, one of the last men aboard the Demeter emerges from the hold “a raging madman, with his eyes rolling and his face convulsed with fear” (113). After a few moments, “his horror turned to despair and… he sprang on the bulwark and deliberately threw himself into the sea” (113). A single interaction with Dracula is enough to send each man overboard, as each man opts for suicide over enduring the rest of the trip with Dracula. In general, it seems that Dracula’s presence sends characters into a state of self-destructive madness.