I have a 2006 Rav4 that had a similar problem the week after pickup. Turns out that we assumed the headlights would turn off on their own (auto, right?), but if you turn on the headlights after turning off the car, the headlights stay on. Needless to say, running down the battery was our fault.
Are you sure you didn't do anything the night before to leave something on?
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