Best sleep gadgets of 2021: Drift away with smart sleeping masks, white noise machines, and more

Humans spend approximately one-third of their lives asleep. It should really come as no surprise that the market for assistive sleep aids is a multi-billion dollar industry. There are myriad devices designed to help people slowly drift to sleep at the end of the day and wake feeling rested and refreshed. From smart sleep masks and white noise machines to devices engineered to optimize pillow and bed temperature, here are six of the best sleep gadgets of 2021.