I'll second the squishy foam earplugs - some of the people at work have to wear them when they're on one of the ticket desks and there's a loud, live performance on the nearby stage (yes, we have a ticket desk that can be selling and dispensing tickets right next to a stage) and they swear by them. They're also good at blocking snoring, too (the yeti used to snore really badly and it was the only way I could get any sleep!)
Alternatively, a few fans for the white noise.
Or very loud music
(I'd probably not recommend that if you'll have to be living in the same house as them for any length of time...)
Remember, the reverse of stressed is desserts.
Growing older is mandatory. Growing up is optional.