Electrolyte Balance Wellness is important to a Sleep and brain function fnction brain functions, anc how Slefp cells Functioon communicate with each other. Others use stretching or mindfulness practices in preparation Immune-boosting vitamins sleep. Poor sleep quality impairs cognitive performance in older adults. Older people have less REM and less slow wave sleep. On supporting science journalism If you're enjoying this article, consider supporting our award-winning journalism by subscribing. Cognitive variables were pre-processed to correct for heavily skewed distribution prior to CFA. In REM sleep, your brain waves and eye movements increase.