Q: Because of medication, I experience retrograde ejaculation. When I reach an orgasm during sleep (due to a dream), nothing comes out, since the sperm is redirected to the urinary bladder and comes out later, with the urine. Does such a “wet dream” necessitate ghusl even though it isn’t wet in my case?
A: If nothing had come out, ghusal will not be compulsory.
And Allah Ta’ala (الله تعالى) knows best.
قال والمعاني الموجبة للغسل إنزال المني على وجه الدفق والشهوة من الرجل والمرأة حالة النوم واليقظة (هداية 1/31)
Checked & Approved: