Charak Samhita
तमोभवा श्लेष्मसमुद्भवा च मनःशरीरश्रमसम्भवा च। आगन्तुकी व्याध्यनुवर्तिनी च रात्रिस्वभावप्रभवा च निद्रा ॥५८॥
॥ Origins and types of sleep॥ Sleep is of seven types, categorized by its cause: Tamas, vitiated kapha, mental exertion, physical exertion, exogenous factors, diseases, and normal (nighttime).
english translation
tamobhavA zleSmasamudbhavA ca manaHzarIrazramasambhavA ca। AgantukI vyAdhyanuvartinI ca rAtrisvabhAvaprabhavA ca nidrA ॥58॥
hk transliteration by Sanscript