Bluetooth sleep masks don’t only block out light, they also let you stream audio. I spent weeks testing some of the top-rated ones on the market The best sleep masks in the US: I spent six weeks testing 24 masks, and these are my favorites My sister has fallen asleep to the dulcet tones of Law & Order every night for years. I myself am partial to the sound of rain at bedtime . A friend, meanwhile, swears by sleepcasts. One gadget that could work for all of us – and may work well for you too – is