About 2% of my dives are night dives. I would like to have done more but either lack of an agreeable buddy, less than the minimum required to get a boat to move, being tired from diving all day, or knowing that I’m already committed to getting up early the next day to dive again has kept me from doing more. People are usually too tired by dark to dive. What I think some of these dive operations should try is do night dives really early like 5am. The schedule could be to start before dawn and do a night and twilight dive, go take a nap, eat lunch, and do a couple more in the afternoon. The shop also needs to provide food as part of the package since restaurants at many dive destinations aren’t open at that hour and it’s hard as a vacationer to find time to go grocery shopping while on a trip.