Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings of Allah be upon him) said: "Dreams are of three types: glad tidings from Allah, thoughts from the self, and frightening (dreams) from Satan. When a person sees a pleasant dream, he may relate it, and if he sees an unpleasant dream, he should not relate it to anyone and should stand up and pray."