Per KenK:

I need something that fits in the ear, not on the surface like ear muffs or
headsets with or without music. I want something I can sleep comfortably
with. The sound generators that make surf or rain or whatever sounds don't
help me much.

I like the yellow foam ones that have to be twirled into a small size
and then inserted into the ear where they expand to a perfect fit.
--
Pete Cresswell