I'm 22 and I've been dealing with ejaculation during sleep for the past 45 days. I know it's pretty common, but this has been happening continuously. I usually masturbate once a week or maybe twice a month, and when I do, it's about 3 to 4 times in one go. But I haven't done that for around 15 to 20 days now. Is this normal, or should I be worried?