Vagus nerve stimulators promise to ease nighttime anxiety and prevent 3 a.m. wakeups — here's how to do it at home (without spending $900)

A woman sleeping on her side in a bed with all white bedding.

Vagus nerve stimulation is the biggest trend in sleep tech right now, promising to ease anxiety and improve sleep by sending calming signals throughout your parasympathetic nervous system.

And research suggests it works — but you'll have to fork out a high price to give it a go. Some vagus nerve stimulators (or VNS) cost more than even the best mattresses we've tested.