I had similar issues with overnight humidity drops when I first set up my original glass tank also. What I found worked the best was, like Craig mentioned, adding a second water bowl. I put a decent sized (6" dia) ceramic bowl on the cool side, then moved my larger reptile bowl over so that it was halfway over the UTH and partially under the heat lamp. This caused my water in that bowl to evaporate at a faster rate, maintaining better humidity. I just had to keep topping it off every other day or so.
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