I got the night bus from Tulum to Palenque, and I arrived at the Palenque bus terminal at about 5am this morning. One thing that I've learnt in my travels already, is that long-haul night buses are a double-edged sword. Sure, you're saving a day's worth of actual holidaying. Sure, you're saving a night's boarding costs. But sadly, you have to arrive at your destination, and then sit in the bus terminal, and wait for the sun to rise and for the world to wake up. This is not so cool.
I've had enough of Mexico City by now. There's more to see here, of course: mainly museums, art galleries, and markets. But at the end of the day, it's just a (really) big city. Everyone here seems to just be treating Mexico City as a thoroughfare, or as a waypoint; but not as a destination. So I hopped on a bus and went to Xalapa.