In Germany it is perfectly legal to fly at night, as long as you posses the "night qualification" on your license. A few years ago you could fly in uncontrolled airspace without a flight plan but this changed to flight plan required on ALL crosscountry flights.
Night flying can be really nice.... but unfortunately there aren't that many airfields open at night
otherwise no problem... just make sure you do a proper flight planning and make sure the weather is good....
Westy