I'd love to ponder a black hole at night. My missus would never allow it though.I do much the same. Tho i prefer pondering black holes.
Like many my quality of sleep can be aligned with my intake of alcohol. If I drink to much, it's game over and I'm awake until 3 or later. I limit myself to Friday nights now, as I have sat and sun to recover some sleep. Especially naps when my 6 month old is sleeping too!