At the nighttime most kinds of sport are unavailable. I practice night jogging and night swimming, but it's not always safe jogging in the night streets or swimming in night Mediterranean Sea.
My idea is inventing special extreme kinds of night sports - that could be simple modifications of existing sports, like basketball played with luminescent ball and basket on a luminescent field, or football played by teams wearing luminescent suits and shoes. Paintball, bowling, chess, pool, american football - everything can be played in complete darkness with luminescent apparatuses and accessories. Such sports would be so much fun to play!
First of all I'm going to try luminestent ping-pong in solid darkness

ps: night-vision devices could also be used in night sports