Never. I'm actually quite sane, despite any seemings to the contrary. I think about it every so often though.1) As I said, the earth doesn't in fact rotate around the sun. Watch-selling conspiracy.
2) Hardly an "impossibility", everyone else would just have to keep strange hours. Difficult, but not impossible. Hence "ideal". I don't expect to achieve it, it's just a convenient basis for comparison.
3) Really, I shouldn't have based #2 on the idea that time exists, it makes my arguement in #1 seem less solid.
4) I guess I should just give up on numbered lists about now.
5) Top 5 reasons why nobody laughs at John's jokes?