Hi, we enquired a while ago when they first started doing the sleepover at Discovery cove, it sounds brilliant but we were told that we would need to bring sleeping bags with us, Could have changed by now, but at the time all I could think of was do we take up valuable suitcase space with 4 sleeping bags, or do we buy them over there, adding again extra cost even though they will probably be cheap as chips, and then again they will be taking up valuable room in Lugage!!
Hopefully I would think that by now they might realise that several people who have to travel by air will find this awkward and possibly you could hire them.
Anyway best of luck Im sure you will have a fab time whatever you decide to do.