I'd worry about Festool taking over your brain and getting you to assemble sanders over night. 
Are you sore in the morning after using those, feel like you didn't get any sleep? Hmmm?

Seriousness aside, the capabilities of these modern "ear plugs" is amazing. I have a set of shooting muffs I wear when using the lunchbox planer (can make your blood curdle), but yes, sweaty ears is no bueno.

Same with some of the older "active" headsets. In the ear is the way to go if you can find a good fit.