Don't you observe (Tahajjud) prayer? I ('Ali) said: Messenger of Allah, verily our souls are in the hands of Allah and when He wants to awaken us, He awakens us. The Messenger of Allah (ﷺ) went back when I said this to him. He was striking his hand on his thigh while returning, and I heard him say: Verily the man disputes with many things.
Sahih Muslim Book 6, Hadith 246
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Sahih Muslim Book 6, Hadith 245 Next Hadith → When any one of you goes to sleep, the devil ties three knots at the back of his neck, sealing every knot with:" You have a long night, so sleep." So if one awakes and mentions Allah, a knot will be loosened; if he performs ablution two knots are loosened; and if he prays (all) knots will be loosened, and in the morning he will be active and in good spirits; otherwise we will be in bad spirits and sluggish in the morning.

Sahih Muslim Book 6, Hadith 247