Assalam alaikum, True dreams are part of Prophethood, as it was reported that the Noble Messenger of Allah, Sallallahu alaihi Wasallam, said:-- "True dreams are one of the 46 parts of Prophethood." [Bukhari, 6472, Muslim, 4201] Mother of the faithful, A'isha, may Allah be pleased with her, said:-- "The first revelation that was granted to the Messenger of Allah, Sallallahu alaihi Wasallam, was the true dream in a state of sleep, so that he never dreamed a dream but the truth of it shone forth like the dawn of the morning...." So, why are dreams one of 46 parts of Prophethood? This is because dreams marked the onset of Revelation [Wahyi] as we find it in Sahih Bukhari 3, and Sahih Muslim, 231. The first Wahyi came down for 6 months, and Wahyi lasted 23 years. The first Wahyi being 6 months (because 2 six months is equal to 1 year) 2 multiplied by 23 years will be equal to 46 months. Thus dreams are One of 46 part(s) of Prophethood.