They should:

• Be highly sound-dampening; enough to completely mute a loud snorer in the next bed over. Active noise cancellation is acceptible, but drowning it out with music is not. I want silence, not just "no snoring".

• Be comfortable to sleep in. This rules out the large rounded profile of most earmuffs like a construction worker might wear in a high-noise environment. I'd also prefer they just be over-ear rather than sticking into my ear like an earplug, but this is negotiable.

• Be $75 or less.