The SleepMask has been the product we use most. That's because it's fool-proof simple. First, it blocks out 100 percent of light, which is better than any beauty-focused sleep mask. Second, the rhythmic vibrations lull us to sleep better than white noise ever could. For sleeping in strenuous circumstanceson a plane, in a weird time zone, or during the day after a night shift full of PEDsnothing gets us there like a Therabody SleepMask. It's just the right amount of tech to sleep with.