I get this quite often, especially when I have to take opioid painkillers, so its not a surprise that kratom may cause it too. I usually wake up, cant move and then there is someone in the room with me walking towards me very ominously like they are going to cause me harm. And then I wake up drenched in sweat heart pounding. This will repeat many times in a night until I eventually stop trying to sleep. I found the best way to get through it is to put a movie on my phone and put in ear plugs. I usually watch a narnia film because its on youtube and is a very calm movie. Do you also sleep walk? I do this quite often too. People have seen me open the back door and go for walks at night, its so weird. The worst thing I do is piss on things. Ill wake up and go piss on a tv or something, so embarrassing. One time I was at a party and fell asleep, i woke up to this guy yelling at me. I'd walked into his room and started pissing on his bed/him.