People who experience trauma are more likely to wake up during deep sleep because their overall sleep architecture is fragmented
. And it’s this uncanny phenomenon that not only gives us profound insight into how the dissociative mechanisms during sleep come about and how they can collapse, but also provides clues about the nature of consciousness itself.Each night, you go through 90-minute cycles of sleep, moving through unique stages. During “light sleep” your heart rate and body temperature drop, a sort of transition phase between wakefulness and sleep.
Neural neighborhoods important for logical thinking and self-awareness like the dorsolateral prefrontal cortex remain napping while areas concerned with movement are widely awake. The former explains why the sleeper is so uncontrolled, confused, and lacks total insight; the latter why the person can move freely around. Emotional brain centers and the lower part of the brain essential for a sense of balance are also turned on.
Stress can also trigger sleepwalking, or at least make it more frequent and severe in those with these genes. Mental anguish is a major source of brain arousal which is difficult to switch off at night, known as nocturnal arousal. A striking example is those who’ve experienced trauma. A recentshowed that patients with PTSD have more and longer awakenings than healthy people do—they simply cannot sustain their sleep.
What’s more, people with trauma also have less and thinner nerve fibers, going from the front part of the cortex and their emotional brain that helps keep it in check, similarly to brakes on a car. Their emotional brain has virtually free reign, making their brain vulnerable to arousal during the deepest of sleep.
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