Your body can usually tell you if you slept well. However, a good sleep tracker can give you valuable insights into how you are sleeping and even provide suggestions on how to make the most of your 40 winks. Sleep tracking is becoming a very hot industry and new devices are springing up monthly. Sleep trackers go beyond just tracking movements. They now can monitor your heart beat, body temperature, breathing and more. As more household devices are connected to the internet, some of these trackers will work with other devices such as your thermostat to regulate temperature to help you fall asleep, stay asleep and even wake up.