I also wake up frequently crying and screaming. However, I can’t blame PTSD.
I’m just alone.
Due to interminable staffing problems, I work two days at 5am and three days at 2pm.
I’ve learned that the first sleep is for body recharge, then the second sleep for REM recharge. Getting comfortable is harder in the first phase, extremely easy in the second phase.
The key is eating something really nutritious when you wake up halfway through the cycle.