I wish someone could solve the problem at the receiver end, i.e., invent noise-cancelling headphones/earplugs that actually cancel noise as effectively as eye-masks cancel light.
In addition to sleep needs, the world has gotten noisier now that people are habitually using speakerphones in public in the most obnoxious ways.
Gets you some pretty good quiet for sleep. It's not active noise cancelling, but they work pretty well.
Anecdotally if you wear a pair of westone solids, and then a pair of earmuffs on top of that, you are basically just hearing through your bones, which can't be avoided (with passive or active).
In addition to sleep needs, the world has gotten noisier now that people are habitually using speakerphones in public in the most obnoxious ways.