A pissed off neighbor?
Probably a nail puncture. Could be a bad stem, or in very rare cases, a bent wheel.
Foreign object puncture, leaking valve stem or wheel bead. Sometimes through sidewall cracks on old tires.
Your tire has been most likely punctured.
Generally speaking, a loss of air. The other answers covered it, I just had to throw in the obvious sarcastic one.
In addition to the other possibilities mentioned above, a slow leak is barely noticeable until left to sit for a few hours or even days. I had the same thing happen to me but looked more like someone slashed my tire :/ I just don't know who.
I don't know, but I speculate that because temperature decreases during night time; the movement of atoms decrease in tires.
A leak.
What causes a tire to go flat over night?
