Which cranial nerve is involved with insomnia?

Insomnia is not directly linked to a specific cranial nerve; however, the vagus nerve (cranial nerve X) plays a role in regulating the parasympathetic nervous system, which can influence sleep patterns. Dysregulation of this nerve may impact stress levels and relaxation, contributing to sleep disturbances. Additionally, the trigeminal nerve (cranial nerve V) can be involved in conditions like sleep bruxism, which may affect sleep quality. Overall, insomnia is more often related to broader neurological and psychological factors rather than a specific cranial nerve.