If you are not masturbating on a somewhat regular basis or having sex, the body will usually take care of it on it's own. So to answer your question, Yes, it's normal.
It is often called a wet dream and is quite common and, yes, normal.
Are your sure your not having a "wet dream". This is common in young males. And will happen when having dreams about sex. During the dream you will develop an erection and can ejaculate. Just as other dreams, you might not remember the dream but the evidence of your dream will be in your under pants. Since you didn't indicate any sperm leakage during the day, I suspect you are having wet dreams. Hopefully you will remember one! They can be quite pleasurable. Regular masturbation can reduce the frequency of these dreams if you are trying to prevent them.
Everyone dreams, although many people don't remember their dreams. So having a dream doesn't mean anything unusual. You are normal.
nothing
It's a dream. Dreams are sometimes not real. It's normal. Not really sure what the question was though.
Nothing. Having a good dream.
To me they are dreams that make you ejaculate by doing something in the dream that will trigger your penis.
No. Dreams occur during certain stages of sleep. If for some reason a person is constantly disturbed, that person will not sleep well and will not attain a full dream cycle. Having noted that exception, in the normal course of healthy sleep, all people do dream.
Yes. Normal, healthy people dreams several times during each period of sleep.
Technically the correct terminology would be ejaculation (the release of fluid from the urethra). But yes, a male can ejaculate when he is dreaming. They are called wet dreams. The correct name is nocturnal emission. Also sperm is not a verb so you don't say 'how can you sperm.......' The correct verb is ejaculate so you say: 'How can you ejaculate in your dreams.'
If he has reached Puberty and has a wet dream (nocturnal emission), he will ejaculate in the night !
Yes a wet dream is where you ejaculate in your sleep.