The importance of deep and REM sleep is crucial to achieving restful and restorative sleep, according to experts. The number of hours you're asleep doesn't necessarily equate to the amount of deep sleep you're getting, but the importance of REM sleep can be found. A magnesium supplement can help relax the body and nervous system, which can help you fall asleep faster and stay asleep and cycle through the sleep stages effectively. Magnesium is an essential mineral that 43% of U.S. adults currently aren't getting enough of it, and this can impact your sleep. Some people have more difficulty achieving deep andREM sleep due to issues like insomnia or anxiety, certain medications, or drinking before bed.