
they are common: far more than he is willing to admit and they are the prime reason he DOESN’T sleep often. the moment he even passes out for a few minutes, he ends up having SEVERAL nightmares.
some of them he can HANDLE, but a vast majority of them he CAN’T. thus, he does everything possible to AVOID sleeping — he might HAVE to every once in a long while, but he almost always HATES every moment of it.
they usually revolve around his time in hell, his childhood that is a MASSIVE blur, and then him actually losing everyone. there are others, but those are the most COMMON ones.