Originally Posted by
3Cforme
I don't think your plan will fly - pun intended.
DTW is a 24 hour airport insofar as it is available for operations around the clock. With regards to scheduled services, however, there's a big gap, and I believe airport police will tell you that you have no business on a concourse. Today (for reference) Delta's last scheduled departure is a 10:38PM to AMS, and last in-bound a 12:30AM arrival from ATL. Tomorrow's first outbound is a 6AM to ATL.
There are numerous 2* (and below) airport hotels with shuttles. On a good night $90+ tax will even put you at the Sheraton.
People have to sleep inside when they miss flights, flights are cancelled, etc. They dont kick you out because your connecting flight isnt for a few hours overnight.