My beardie has lately been going to sleep a little before the lights turn off. Not super early, maybe an hour. I didn't think much of it, but I was reading another thread that said this was an indicator of stress/not being happy in the viv. Is this something I should be concerned about? My setup has been approved by people on this forum. But I guess most relevant to this would be her daylight cycle. She's on 15 hours (6 am-9 pm). Her last meal of the day is around 4 pm. Should I turn the lights off earlier? Or is this normal?