I love night diving! Not only do you see more of the critters that are hiding during the day (crab, lobster, octopus, etc) but your attention is focused by your flashlight, so you see more of the small things that you might miss during the day. Also, because you are carrying an artificial light, you see more brilliant colors in the reef (red, orange, yellow) that are normally filtered out of sunlight by the water at depth.