There was a previous question about earplugs. I do sometimes have a problem with water not draining from my ears---not always, just sometimes. I don't know what it's about, but did find some earplugs that actually work. They're the consistency of modeling clay and can be reused. They work very well for sound, too. So well that i didn't hear the wave coming up on me or my wife trying to get my attention to se a turtle.

They're here:

http://www.earplugsonline.com/