What are the classic signs of a wet dream?
I take it that you are wondering if you've had one.
Since ejaculation occurs during a wet dream, there will be semen in whatever you wear to bed at night or on the sheets of your bed. Depending the time between when you ejaculated and when you wake up, the semen will still be damp and sticky or it will have dried. Since semen has a high sugar content, it will make whatever cloth it gets on stiff, like it has been starched. None of this is a major issue as it washes out of clothing and sheets very easily.
The rest depends on how heavily you sleep. Some boys remember having a strange or erotic dream. Some wake themselves up just before or just after ejaculating.