Tarmach
If you fly in a well lit area at night you will find that you can see the drift as you fly along. If its not well lit, you will have to fly as though you are in IMC heading and time.
Distances are more difficult to judge at night because you can see lights further away. Towns look larger than they really are and appear to join up.
Despite a low surface wind you may have a strong wind in the circuit or on your navex, there is less thermal mixing at night.
Don't use a Prayer Wheel in the aircraft!!!
Make sure you know what an electrics failure looks like and what to do. The battery normally lasts longer than the fuel, except at night when its supplying more current.
Make sure cloudbase is above the Safety Altitude, watch out for thin stratus layers creeping in below you.
If the engine fails put the landing light ON, if you don't like what you see turn it OFF.
Have fun!