How can I stop moving against my bedding while sleeping and prevent ejection?

I have a question regarding my personal problems. Long ago I used to masturbate , But Alhumdulillah ,with the grace of Allah S.W.T i was able to overcome it and have left that filthy habit for around more than 3 -3.5 years. But now from around past 2 or more years, I face a problem during sleeping. While sleeping I start moving against the bedding (as someone would move while doing intercourse) I don’t know when do i start moving during my sleep and by the time I gain my actual consciousness I am already moving against the bedding and about to eject. Sometimes when i gain my consciousness .. i am able to stop this moving , thereby preventing any ejection..and sometimes I just cant do it since the ejection is just about to take place…. It gives me the same feeling as masturbating when i move ….. BUT I DON’T WANT TO MASTURBATE , NEITHER I WANT TO DO THIS FILTHY THING DURING MY SLEEP OR ANYTIME… BUT I ALWAYS GAIN THE CONSCIOUSNESS WHEN THE EJECTION IS JUST ABOUT TO TAKE PLACE- AND ALL OF THIS STARTS WITHOUT MY WILL( i DON’T KNOW HOW DOES THIS BEGINS WHILE I AM SLEEPING – could it be the case that some shaytan or jinn makes this happens)? Please tell me a way to get out of this problem I also try reciting Ayat al kursi before sleeping ..but there is no change in this problem. sometimes it happens continuously for 2-3 days sometimes not at all for 10 or more days . Also do tell me some amal which can be helpful to me to stop this. I am very disturbed at the moment because of this as this also causes the waste of sperm which would be a problem in my marital life.