Having BTA's I read this forum regularly. I have seen many folks giving advice to others worried about a nem deflating or shriveling up regularly because their nems also regularly deflate or shrivel almost daily and sometimes even when the light is on. I've never observed any of my nine doing this in the 3 years I've had them and have to wonder is it really a normal healthy behavior? Even when the lights are off they stay open. Pic at bottom is an hour after lights have gone off taken with a flash and other is obviously during the day. They do show very slight deflation as compared to daytime but not much. I don't feed mine at all if that could be the reason.