A:Answer Hellp! Philips Smart Sleep Deep Sleep Headband Beyond sleep tracking, the sleep-enhancing headband and sleep app is a complete solution that actively improves your sleep. During the night our bodies cycle through different stages of sleep: rapid-eye movement (or REM), and non-REM sleep, which has three stages. When your body is in the third stage of non-REM – deep sleep – your heartbeat and breathing slow to their lowest levels and muscles relax. This is the most restorative stage of sleep often called "slow wave sleep".
