This article is a part of CNN Underscored’s Guide to Sleep, a weeklong focus on everything you need to sleep better. We’ll be featuring new products, tips and exclusive deals all week, so check in ...

H. Damon Matthews receives funding from the Natural Science and Engineering Research Council of Canada. Glen Peters receives funding from European Union’s Horizon 2020 research and innovation ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Joshua Lyon Joshua Lyon is a writer covering home and decor. He's also the ...