Weird shits happening

So I don’t know where to start so I’ll just put it all on the table. My Boyfriend and I have been TTC actively for about 3-4 months. Long story short twice in the last 2 weeks I’ve woken up to my boyfriend freaking out saying i bit him. And sure enough turn on the light and there’s a bite mark. I dont remember even doing it. Has anyone hear of anything like this? My stress levels have been higher then normal. But I’ve never done anything like this before.