Since the primary goal of sleep is to have the brain enter the Delta frequency stage, PEMF devices can also be thought of as a Delta Enhanced Entrainment Program (D.E.E.P.). This program focuses on persuading the brain to follow a Delta frequency for sleep. Since the Delta stage can sit anywhere between 0.5Hz and 4Hz, it may take some time to discover which Hz level that best fits with your brain’s preferences. Research has shown that using a continuous single-frequency throughout the night usually works best for training the brain versus changing frequency over time.