The absolute worst feeling in the world is waking up soaked in sweat because it's slightly too hot, then adjusting the AC, but now you're freezing cold because you're literally soaked and being blasted with cold air. And the rest of the night is spent alternating between being uncomfortably hot, and uncomfortably cold.

At that point you might as well just accept the fact that you're not gonna get a good night's sleep that night.