Yōga Sūtras
Yōga Sūtra 1.10
अभावप्रत्ययालम्बना वृत्तिर्निद्रा।
Absence of interest and lethargy is sleep (nidra).
Sleep is supported by absence of cause. When cause like interest and desire are absent (may be due to lethargy or tiredness), it results in sleep.

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ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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