Changing enemy icon's colors to brite yellow or orange would look good at night.
Night time is a deal close to my heart. I loved it back in the day and have posted many times.
Someone mentioned above about a real 24 hour cycle and having nightfighters. Not a bad idea except who gets stuck with the night? The Euro crowd, the Asian folks, or the USA? Maybe a 6 or 8 hour rotation might be best. It might also help do away with the Arena changes daily - (Off hours). Yet, the window for many is small. I understand the reasons, but still wish we had a way!!