The 40-year old bedroom door easily passes sound. The door is
practically made up of thin plywood sandwiched to 1" x 2" studs
separated vertically by half a foot or so. The door closes tight, but
just enough to slip a credit card thru. Eventually, sounds of laughter
go into my R.E.M. sleep and create nightmares. I then go to work
at the grave yard shift like a Zombie. I'd tried and gave up using
earplugs since they keep falling off, create sores or just got tired of
disinfecting them to reduce ear infections. What are some ways I
can reduce sound on this rental unit?

Thanks