It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that a man came to the service of the Holy Prophet (peace and blessings be upon him) and said, "I saw that someone struck my head and I saw him rolling away." The Holy Prophet (peace and blessings be upon him) began to smile and then said, "At night, Satan comes before one of you and frightens him, and then that person goes around in the morning telling people about it."