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abhāva-pratyaya-ālambanā tamaḥ vṛttiḥ nidrā

अभावप्रत्ययालम्बना तमोवृत्तिर्निद्र

Deep sleep is the fluctuation of obscuring, supporting a non-appearance of psychic activity

abhāva - non-appearance, non-existence, absence

pratyaya - psychic activity; cause; conception, assumption, notion, idea;

ālambana - supporting, resting on

tamas - obscuring

vṛtti - fluctuation; modification; turning; set in motion, course of action, behaviour, movement; activity, function; profession

nidrā - deep sleep

Commentary by Paul Harvey:

Deep sleep is the obscuring of the fluctuations, resulting in the non-appearance of mental activity.