I'm having Frequent Wet Dreams. Is that some kind of a disease? I'm also having nocturnal emissions

I'm 18... And I've wet dreams very frequently. Am I having any sort of disease? Or any problem?And I've noticed that drinking more water in night time causes this problem but it's not the same always. is there any realtion with drinking water and having nocturnal emissions? Sometimes it also happened that I've had wet dreams in 5 nights of the week. Pls help me to overcome this problem.