Did you send your kid to montesori type of private school? they don't do
discipline and it is normal for kids to act out once in a while. I got
complaints almost every month even if my son is usually very nice boy. Talk
to the teacher and ask about more details like how he cried, how long did he
sleep, exactly what they did. He might just got scared after waking up and
peed himself all wet. The teacher might have been a little hush. Tell them
that your boy is usually ok and it is a special event that you will go back
to talk to your son first. You do not have to give them response immediately
. Find out why is the first step. The boy might just need more sleep at
night so he won't have such a heavy nap in the afternoon and peed all over
himself. good luck!