1. Plural of hypnology; the study of sleep, hypnosis, or the scientific investigation of sleep phenomena and their effects on human behavior and physiology.
Usage: technical; academic; rarely used in everyday English

Examples

• The research institute specializes in hypnologies and the treatment of sleep disorders.
• Modern hypnologies have revealed much about REM sleep and dreaming.
• She pursued advanced studies in hypnologies to understand the mechanisms of consciousness during sleep.
• Hypnologies combines elements of neuroscience, psychology, and medicine.