Hi Devon,
In the U.S. there is §91.209 Aircraft lights. And (afaik) one will need a PPL (for night privileges).
In terms of practicality (for flying at night), a motorglider could fit the bill. One will need a logbook endorsement for the motorglider - §61.31 Type rating requirements, additional training, and authorization requirements ("Additional training required for operating a glider - Using self-launch procedures").
If carrying a passenger §61.57 Recent flight experience: Pilot in command for nighttime currency will apply.
-Rob
Edit: I believe that for the motorglider, §91.205 Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements also applies.