It is narrated in a hadith that the Devil ties three knots in a person’s hair when he goes to sleep.
When the person awakens and remembers Allah Ta’ala one knot is opened. When he makes wudhu another is opened. When he prays salaah then all the knots are opened and the person becomes cheerful, in high spirits and energetic.
If not, then he begins in a bad mood, sluggish and lazy.
(Sunan Nasaai, Pg 239)
