Whenever the Prophet (saws) retired to bed every night, he (saws) used to cup his hands together and blow over it after reciting Surah Al-Ikhlaas, Surah Al-Falaq and Surah An-Naas, and then rub his hands over whatever parts of his body he was able to rub, starting with his head, face and front of his body. He (saws) used to do that three times.