Is there some advantage to sleeping when it is dark and waking when light?

Yes. That is the natural state for you to sleep in. Melatonin is a hormone that is only secreted in darkness, and it mediates a great deal of things that your brain needs to do while you sleep. Think of it like your hard drive cleaning itself. If you choose to sleep during the day, make sure the room is completely blacked out, and is cooled to 68 degrees fahrenheit. .