(18) باب قِيَامِ اللَّيْلِ
Narrated Abu Hurairah:
The Messenger of Allah (ﷺ) as saying: When one you sleeps, 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 another knot will be loosened; and if he prays, the third knot will be loosened; and in the morning he will be active and in good spirits; otherwise he will be in bad spirits and sluggish.
Reference: Sunan Abi Dawud 1306
In-book reference: Book 5, Hadith 57
English translation: Book 5, Hadith 1301