As a boy becomes a man, you will wake up to some "sticky" situations, this is a nocturnal emission or wet dream, and most men have had one at some point in their lives. During a wet dream, men (and some women) ejaculate in their sleep so don't worry this is completely normal.
Why Do They Happen?
It is usually just your body prepping it self as you go through puberty or cleaning its own channels out to stay healthy once you've matured. When your reproductive system starting to work for the first time. You are naturally "over productive" as you body has never used that part of its anatomy before, and signals get crossed resulting in some spillage or a "Wet Dream".
Frequency
Wet dreams are more common at adolencence, and is usualy a good clue that puberty is hard at work within you. The late Dr. Alfred C. Kinsey, a pioneer in the field of sex research, found that boys under age 15 could have as many as 12 a week.”
Religious View on Wet Dreams
Some religions and their books deem a nocturnal emission as an impure act. This is completely wrong and these teachings should be ignored as no natural body function can be impure, especially if their is a creator who made us. In such a case our bodies are doing what said creator wanted them to do. So Do not let men use god as a reason to tell you a natural function is wrong, because the fact is that nocturnal emissions are 100% normal and completely involuntary. This bodely function will happen to upwards of 95% of all men. Granted clean up may be annoying, the only thing you need to concern yourself with is tidying up the spill in the morning!