Wet dreams

So my husband and I have has intimacy problems for the last year and a half. We had a huge blow up a week ago and he begged for yet another chance. 
Long story short...he said he gave up porn for the last week and a half and although we've had sex once during that time and he came, and hasn't masturbated apparently either.
He woke up at like 4am after drinking, and was definitely freaking out in his sleep. I've never seen him sleep like this in 6 years and thought it's because we're about to have a baby next month and he's all worked up. 
 
He fell back asleep but when I got up at 6:40 he wasn't there but in the bathroom. And then I found his underwear soaked with cum on the floor. 
I confronted him and because of the past, I don't believe that he had a wet dream but rather got up early and jerked off. 
He's says he hasn't had a wet dream since middle school or something. He's 25.
 Do you buy that he had a wet dream or that he got up early and got off?