Nightmares Uncovered
Nightmares may often occur during slow wave sleep rather than REM sleep, challenging common beliefs about dream paralysis. The absence of norepinephrine during REM sleep suggests that intense fearful memories are less likely to emerge in that state. Additionally, waking up feeling stressed about dreams can be a shared experience, highlighting the emotional impact of our nighttime thoughts.In this clip
From this podcast

Huberman Lab
Understanding and Using Dreams to Learn and to Forget | Huberman Lab Podcast #5
Related Questions
What are the theories about why we have nightmares? Why do nightmares occur during early stages of sleep when the brain can't process emotions and heal trauma, in addition to happening during REM sleep when the brain is processing traumatic experiences without the emotional component?
Does sleep paralysis happen when you're lacking in REM sleep?