More people are falling asleep to curated sleep music each night. We spoke with experts about the best sounds for rest—and why the trend is growing.

Getting a good night’s sleep is at the top of the priority list for a lot of us, so it’s important to try to maximize the amount of time you spend asleep and not lying in bed struggling to doze off.

While some technology can hinder sleep, certain devices are designed to improve rest. Sleep tech includes items like noise machines, sleep trackers, and heated eye massagers. Wearable devices can ...