Most likely someone called the cops & asked them to check you to see if you were alright.
Thanks. I guess I’ll be more careful where I sleep from now on. I personally think it shouldn’t be illegal. Because I much rather someone sleep and be rested than tired and driving. I had a good friend that got killed that way. If he would have just pulled over and napped for 20 minutes that night he probably would still be alive today.
On second thought who cares what the cops think if you are tired, pull over and sleep.
Just make sure you find a private road. Or better yet, take money along to check into a motel for a couple of hours.
One day years ago, I visited a friend in Baltimore. He had plans that night, but directed me to Fells Point for some fun places to party. I got down there around 5 PM, and did have fun. 
At about 3 AM, I finally found my car. I was definately not in a condition to drive. It was a relatively dark street (a main one, but the street lights weren’t very effective; I’m surprised I wasn’t mugged), so I just got in the passengers seat and reclined it all the way and fell asleep.
At about 8 AM, I finally came to. I was still kind of buzzed, but not drunk. The passers-by didn’t seem to give me much attention as I walked around to the driver side and took off for DC. So either I wasn’t seen by the police, or they see my situation too often to worry about it.
A quick hijack to share a joke –
Guy drives all night to get to a certain town. When he pulls into town, he decides to nap in the car for a little while. He’s just drifting off when a knocking comes at the driver’s side window. It’s a jogger, and the guy rolls down the window to see what he wants.
“Do you have the time?” the jogger asked.
“No, sorry,” the guy says, and rolls the window back up.
He gets to sleep, and is awakened by knocking again. He looks out, and sees another jogger. He rolls down the window.
“Do you have the time?” the second jogger asks.
“No! I don’t, sorry,” the guys says. He rolls the window back up, but then decides to forestall any such interruptions in the future. He gets a pen and paper from his glovebox and makes a sign: “I do not know what time it is.” He sticks this in his window, and drifts back off to sleep.
He’s awakened by knocking at the window again. He rolls it down, and sees yet another jogger.
“What!” he snaps.
The jogger points at the sign. “Just thought you’d want to know … it’s six-fifteen in the morning.”
In my opinion, just the fact that he’s Willie Nelson ought to be enough probable cause to search him for pot.
A lot of interstate rest stops have 1-2 hour time limits to prevent people from sleeping there. Doesn’t stop people from doing it anyway… how many cops do you know that cruise rest stops every couple of hours?
Wildest
You are lucky you didn’t fall asleep in McD’s parking lot. My wifes uncle did and got ruffed up by the cops for it.
He is about 60.