What do researchers generally see as the stage of sleep when neurotransmitters are replenished?

Researchers generally identify deep sleep, particularly during slow-wave sleep (SWS), as the stage when neurotransmitters are replenished. This phase is crucial for restorative processes, including the synthesis and release of various neurotransmitters that support cognitive function and mood regulation. Additionally, deep sleep facilitates the clearance of metabolic waste products from the brain, further contributing to overall neurological health.