Consistently inconsistent

You and your sister are making our lives interesting. Granted you did not get to take your normal nap (12:30 to 2:30, it was short due to a party) and you fell asleep on the way home and slept once we arrived (6-7:45?). But two nights ago you asked to sleep in your crib without a story (probably because it was late?) and you slept till 6:30 and nicely slept in our bed till 8. Then last night you slept on the way home (11pm?) and slept thru till 7am.

Now you want to fall asleep on the floor with me. Why?