I can't sleep without the steady whoosh/throb from my dehumidifier and its fan.
A couple of years back, I discovered the ASMR videos on Youtube too - many of which feature binaural beats. Got really into it and could knock myself out with them very reliably. Then after a few months it just stopped , I couldn't get "the tingle" any more. Gave it a break but still not really happening for me like it used to. Feel like writing into one of those problem pages in women's magasines, "help i just can't tingle any more..."