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SB 3.20.19

visasarjātmanaḥ kāyaṁ
 nābhinandaṁs tamomayam
jagṛhur yakṣa-rakṣāṁsi
 rātriṁ kṣut-tṛṭ-samudbhavām
Synonyms: 
visasarja — threw off; ātmanaḥ — his own; kāyam — body; na — not; abhinandan — being pleased; tamaḥ-mayam — made of ignorance; jagṛhuḥ — took possession; yakṣa-rakṣāṁsi — the Yakṣas and Rākṣasas; rātrim — night; kṣut — hunger; tṛṭ — thirst; samudbhavām — the source.
Translation: 
Out of disgust, Brahmā threw off the body of ignorance, and taking this opportunity, Yakṣas and Rākṣasas sprang for possession of the body, which continued to exist in the form of night. Night is the source of hunger and thirst.