Can you make the apartment brighter and not so dark during the day? Also, I have just switched my lights off an hour early. I live in Fla also, so Lights went on today at about 7 and I turned them off at 6 cause it was dark outside and he was in his sleeping position with his eyes open. I have my cage by my computer so I cover with towels at night to not be distracted by the light. I still find it strange that he is sleeping during the day, you said he is eating, drinking, etc, normally. I would try not having the apartment so dark, although I am assuming it has been dark all along and the daytime sleeping was not an issue? I don't think the change in the basking bulb by 15 watts would make the difference. Just my opinion.