I've been through that a few times. Once they offered me an Ambien sleeping pill, which I took.
I slept solidly, woke up feeling good, got dressed, walked out to the car, and had a bit of trouble unlocking the door and getting it started. Drove home okay. Fought with the key to the front door for a while, got it unlocked, then slammed face-first into it after skipping the "turn the knob" part. That's when I realized I was seriously stoned. But I *felt* sharp.
All things considered, I'm probably lucky I made it home without running over something.