Now that I think about it, we didn't use anything at night for our beardies either. They had the UV light that was a long strip of light and a basking light. We had ours on play sand and never had any impaction issues.

Is play sand ok for adults? I would like a natural looking enclosure if I get a beardie.

Anyone care to post pictures of their beardies' setup? I love looking at enclosures and it might give me an idea of a good set up. I remember ours rather easily. We had them on play sand. There was a flat rock formation on one end, used for basking and wood branches for climbing and a food dish. We misted them once a day, not the enclosure, just them.