So far I have not had any issues except the sensitivity thing where the ring enters (or exits) the urethra. I can't sleep naked just yet because when I move it causes the ring to move and I get a jolt! So I'm sleeping in briefs still. I hope that bit of sensitivity fades.
I wore a jock to support the ring when I was pierced. I would never be able to sleep in briefs (don't even own any) Try taking short naps nude to see if you can sleep normally.