How do I know if I masturbate in my sleep?

[Chords]

I wake up often with my hands on my public area. Very often, actually, probably around twice every week or two. This has been happening for years, probably since middle school (I am a highschool senior). When I'm on my period, I wake up with blood under my nails for a good day or two.

Aside from this, I don't know how to tell if I am masturbating, itching, or simply putting my hand there in some sort of  sense of security.

I have never had sex before, nor have I consciously masturbated. I believe I may be asexual.

Please help me understand what I'm doing.

Thank you.

[SingleDude]

I think you are alright, to pleasure yourself is nothing wrong, not medically unless its an addiction, and your sleeping posture maybe something you would like to think about if you find your palms over your genitals while waking up.
Next thing there will be some trace of the ejaculation on your hands, dress or other body part, the liquid that comes out is thicker than water or urine and leaves a mark of some kind.
Three if there is continuous irritation in your genitals, you may scratch them in sleep that is how you find it in morning, go to a doctor in that case.
People do ejaculate in sleep, but they do not stimulate themselves as such, so do not worry, you will know when you stimulate yourself on your bed, and you will know when it comes out....... this is just anxiety probably.

[Chords]

and by "public" I meant pubic.
I apologize for any typos I may have made. My phone's touchscreen is a little funky.