Here is a smart wearable device that promises to improve your sleep quality. Thim stays around your finger as you go to bed and detects when you have fallen asleep. After 3 minutes, it wakes you up, so you can fall asleep again. This way, it trains your body to learn how to fall asleep sooner.
The device has a sleep tracking and power nap module. It wakes you up at the exact right time. Thim connects to your smartphone via Bluetooth. You can find out more about it on Kickstarter.