Remember, Neos are little Vandas. And Vandas will drop leaves to conserve water, since they don't have pseudobulbs. They need a wet-dry cycle, but the dry part should not be for very long, especially if it is relatively warm (house temps) If outside, they can get somewhat drier in winter (when they're experiencing temperatures down into the low 40's F) but even then, if it warms up during the day I still water normally.