We have seen plenty of interesting headphones in the past. The Kokoon headphones happen to be a pair that senses your sleep and adjusts accordingly. Kokoon is designed to be comfortable enough to be slept in. Kokoon adjusts your audio volume and equalization as you fall asleep and adapts your audio to block out unwanted external noises. There is a companion app that lets you configure your headphones.
The Kokoon app can help you improve how your sleep. Whether you are interested in lucid dreaming, sleep learning or meditation, Kokoon can help your cause. The developers have partnered with Onkyo to provide you with a comfortable pair of headphones with Bluetooth. You can find out more here.