There are also anxiety nightmares, but those have a very specific modus operandi, they seem to happen when you first get to sleep. For me at least, when I suffered anxiety nightmares, falling asleep was difficult enough in itself because of the anxiety, but as soon as I did I started having dreams right away that woke me up. It's pretty rare to start dreaming right away when you fall asleep, but anxiety causes sleep deprivation which in turn causes REM rebound, meaning you fall behind on REM sleep and in response your sleep cycles shift so that you start dreaming right away.
On the other hand, if a nightmare politely waits till after you've had plenty of sleep then I suspect it's not anxiety related at all, but one of the diagnostic checks. It makes sense that the body would only do this after you've gotten enough sleep, so as not to screw up your circadian rhythms or make you lose sleep.
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