Withings Sleep is a sleep tracking device designed to monitor your sleep patterns and overall sleep quality. It is placed under your mattress and uses advanced sensors to detect movements, heart rate, and breathing patterns throughout the night. The device provides insights into sleep cycles, including deep sleep, light sleep, and REM sleep, helping users understand their sleep habits. The data collected by Withings Sleep is accessible through a smartphone app, allowing users to view detailed reports and trends over time. It also offers personalized recommendations to improve sleep quality, making it a useful tool for anyone looking to enhance their overall well-being.