How can I sleep much less?
Grandshaykh, may Allah bless his soul, said, “The power of ablution is such that if for forty days you keep it day and night, Shaytan is not able to approach you.” It means to be awake at night (only in seclusion) then after forty nights you will never need to sleep because Shaytan is not able to approach you for forty days, he surrenders. But you need to do that, so that for every moment of these forty days you are never without ablution and after forty days you don’t need to sleep.
Also in a different way, Grandshaykh (q) said, “If you don’t want to fall into the sleepless hands, i.e. be lazy, whenever you feel sleepy make ablution and pray two raka`ats and it will wake you up. Then after half-an-hour, when you feel sleepy take ablution, then maintain that for forty days and afterwards you will never need to sleep.” The need to sleep will be taken away, because it saves us from our imperfections, our sins. Therefore, Allah (swt) gave us eight hours to sleep so that at least we don’t bother anyone! When you sleep six, seven or eight hours with ablution and two raka`ats prayer, for every breath Allah creates an angel that is praying on the Prophet (s), and that reward is given to you and will eat the sins you commit during the day!
[from the suhbat "Recitation of “Bismillahi 'r-Rahmani 'r-Raheem” Solves Problems!"]
Shaykh Hisham Kabbani