Narrated Abu Huraira (Radi-Allahu 'anhu):

Narrated Abu Huraira (Radi-Allahu 'anhu):

Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) said, "During your sleep,
Satan knots three knots at the back of the head of each of you, and he
breathes the following words at each knot, 'The night is, long, so keep on
sleeping,' If that person wakes up and celebrates the praises of Allah,
then one knot is undone, and when he performs ablution the second knot is
undone, and when he prays, all the knots are undone, and he gets up in the
morning lively and gay, otherwise he gets up dull and gloomy."

Bukhari Vol. 4 : No. 491