For a good night of sleep that helps to prep your body for a new day, deep sleep is where it’s at. In deep sleep, brain waves are at their lowest frequency called the delta wave phase
. 90-120 minutes in the phase per night is a typical amount to aim for per night. Sound Sleep Health
, the website for a practice of neurologists, sleep medicine specialists, and insomnia experts, explain that this phase of sleep is the most “psychologically profound stage”. This is because you body goes through an immense amount of recovery during the deep sleep when is releases human growth hormone. This hormone plays a vital role in repairing cells, clearing away built up waste, and strengthening the immune system. The deep sleep phase is important because according to the experts at Sound Sleep Health, it refreshes and restores the body, while it “erases the cumulative sleepiness collected during a normal day of waking activities”.