FRA Overnight Layover Options?
 

I'm looking at a business class round trip on Singapore Air from JFK to Munich. On the return, it has a 10.5 hour overnight layover in Frankfurt. Thanks to this forum, I had a very good experience with the FRA Hilton Garden Inn and can stay there if needed. However, knowing the headache that is FRA, I hate to have to leave and then reenter its secured areas.

Is there any Singapore Air affiliated Business lounge that is open overnight where I could stay comfortably and doze a bit? I don't need a bed. A nice chair in an open lounge would do.

Thanks!

No overnight lounge open in FRA, all lounges close at either 21 or 22 and re-open at either 5 or 6 next morning.
Honestly for that long taking an hotel is the best option, even taking into account that you have to clear security again, agreeing that one attached to the terminal is best, so either Hilton, Hilton Garden Inn or Sheraton.