Non-rapid eye movement sleep activation occurs during NREM that is comparable to the type that occurs during REM. It is this sub-cortical activation that results in dreaming during the NREM stage during the morning hours. During non-REM sleep, the tonic drive to most respiratory muscles of the upper airway is inhibited. This has two consequences: However, because the diaphragm is largely driven by the autonomous system, it is relatively spared of non-REM inhibition. As such, the suction pressures it generates stay the same. This narrows the upper airway during sleep, increasing resistance and making airflow through the upper airway turbulent and noisy. For example,
Eye movement desensitization and reprocessing Eye movement desensitization and reprocessing Eye movement desensitization and reprocessing (EMDR) is a form of psychotherapy in which the person being treated is asked to recall distressing images while generating one type of bilateral sensory input, such as side-to-side eye movements or hand tapping. It is included in several guidelines for the treatment of post-traumatic stress disorder (PTSD). The way it might work is uncertain. It was developed by Francine Shapiro in the 1990s and has been controversial, with some critics calling it pseudoscience and there have been ongoing concerns over the quality of evidence, contradictory findings, significant rates of