I have kept and bred them for several years. They are fairly active, and you will see them basking in the early morning and evening, and foraging for prey at any time of the day. Don't use a too thick layer of sand, PVC tubes make great hides for them, or else you will have to pour water on sand prior to putting your animals inside the tank, then leave heating harden the sand so that it does not collapse on your geckos. Personally speaking, I have tried both solutions and found the second one much better, it also helps a lot finding their tiny and fragile eggs.
Let me know if you can read French, I am the author of an article on their husbandry and breeding in the magazine of the French Reptile Hobbyists Association.