When a man wakes up
in the morning, sometimes, he gets a boner, an erection, a hard on,
whatever you want to call it. Sometimes, when a girl wakes up in the morning, she is wet, aroused, horny.
For men, it's called "
Morning Wood."
It is called "Morning Mist" for girls because of the warm and wet feeling produced down below. Kind of like a mist.