Soak some towels(paper or cloth) and hang them around the room, this should help increase the humidity.
Note: Make sure they arent near the lights, you dont want a fire =)
32C I assume? If so that way too hot for your babies and is definitely the cause of the curling.
Plants (ideally) need the temp to be between 21C-27C(75F-81F), you have any ventilation?