Philips has a headband product called DeepSleep. They claim it increases your deep sleep by playing some sort of sound during your sleep that induces more deep sleep. For some odd reason, despite being a Dutch company, the product was only sold in the US. I spent a lot of money having it imported to Netherlands.

Unfortunately I can't tell whether it works. I rely on headphones and earplugs to block out sounds during the night. Sounds such as cars and airplanes outside, or other people in the house going to the toilet, tend to wake me up unless I block out those sounds. And the handband is not compatible with headphones or ear plugs.

I wish there is a better solution.