15, and wetting the bed...

im 15, going on to 16, when im asleep and then wake up, my shorts/pj's that i sleep in are wet, i dont know if its... my urine, or semen.
Will this stop? And what exactly is it? what causes it?

[horseguy]

It could be either.  How wet.  Nocturnal seminal emission or "wet dreams" are common in teenage boys.  You shorts and maybe PJs would damp or sticky.  If you are bed wetting, you would be quite wet including your sheets.  Has this just started?  If so and small wet spots then likely wet dreams.  If bed wetting and its new, then you should discuss with parents and doctor.  Bed wetting will often stop on its own and usually be 15-17 years of age.  I was a bed wetter from age 6 to 13.

[2K9TU]

Well i guess my PJ's are a bit damp, and this has been going on since i turned 14. Also i havent seen any small wet spots on my bed.