The Withings sleep is a sleep monitor that you place under the mattress to analyze your sleep behavior. The device shows your sleep cycle, follows your heart rate and detects snoring. You link it to the free Withings Health Mate app for personalized coaching, which improves your sleeping behavior. In the morning, the monitor automatically sends a report of the last night to the application. You set up the Withings Sleep once, so you don't have to reactivate the device every night. In addition, you use it in combination with other Smart Home equipment, such as lamps or the thermostat.