What is the opinion of Reddit about the
OnAdonis Sleep Mask-Blackout Eye Mask for Sleeping, Quality Comfort 3d Concave No Eyelid Pressure Eye Cover for Men Women Travel Yoga Meditation?

Blackout eye mask for better sleep – to block out light from outside (e.g. street lamps). I have blackout curtains, too, but the mask is better ROI. There are probably some <$10 though this one I bought is $13.