1. A condition of sleep created by hypnosis: Somnipathy can occur when one individual has an influence on another person, or which is received by anyone from another, and the effects thus produced, as seen in hypnotism, and in yawning, or by the process of mesmerism.
2. A disturbance of sleep or any physical or mental disorder of sleep: Somnipathy can be severe or intense enough to upset a person's usual physical, mental, and emotional behavior or reactions.