Night diving solo can be a wonderful experience, enhancing the pleasures of solitude that accompany all solo dives. One of the things I enjoy most about diving is that solitude, the feeling of being deep in the moment in a different world. I do almost all of my dives solo, except when I have no choice when on holiday in a tropical location. Even there, I've managed to convince one operator to allow me to solo dive just off his dock. It's only 15 to 25 feet deep, but absolutely glorious, the complete freedom. I'm at an age where I don't do decomp dives any more, but if I did I'd probably want a companion who knew what they were about.