Does having wet dream require performing ghusl?
If a person has wet dream but does not see wetness on his body or underwear when he wakes up, he does not have to perform ghusl (Ibn Abidin, Radd al-Muhtar, I, 302). On the other hand, if he does not remember having wet dream but sees wetness on his body or underwear when he wakes up, he needs to perform ghusl (Abu Dawud, Taharah, 96; Tirmidhi, Taharah, 82).
Aisha (r.a) narrates: “The Prophet (saw) was asked about a person who found moisture (on his body or clothes) but did not remember the sexual dream. He replied: ‘He should take a bath.’ He was asked about a person who remembered that he had a sexual dream but did not find moisture. He replied: ‘Bath is not necessary for him.’ Umm Salamah then asked: ‘Is washing necessary for a woman if she sees that (in her dream)?’ He replied: ‘Yes. Woman are counterpart of men.’” (Abu Dawud, Taharah, 96; Tirmidhi, Taharah 82). Again Aisha (ra) narrates, “Umm Sulaym (ra) asked the Messenger of Allah (saw), ‘If a woman sees what a man sees in dream, should she take a bath or not?’ The prophet (saw) replied: ‘Yes, she should take a bath if she finds the liquid (vaginal secretion).’” (Muslim, Haidh, 33; Abu Dawud, Taharah, 97; Nasa’i, Taharah, 135). Therefore, women also need to perform ghusl after having wet dream if they see wetness on their underwear, just like men do.
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS