Sleep Running

Somnambulism - Walking while you are sleeping a.k.a sleep walking

What is sleep running? My definition : Falling asleep while you are running.

In both cases, you won't know that you are doing two things simultaneously, only the order of sleeping is different.
So when do people sleep run? Most of the guys who 'sleep run' are people who are sleep deprived. One famous example is that of the ultra-runner, Dean Karnazes(author of the book - UltraMarathonMan), who works by the day and runs by the night and sometimes manages only 2 hrs of sleep. So it isn't unusual for Dean to suddenly wake up and narrowly avoid colliding with an approaching car.
I had my first experience of sleep-running yesterday. I had slept for less than 12 hrs, the previous 3 days and only 1.5 hrs the day before yesterday. The irony here is that, try as I might, I was simply unable to catch up on lost sleep yesterday afternoon. So as the clock ticked 5, I got out of my weary, pathetic state and headed out to the stadium. I normally warmup by stretching a bit before running. But as I started my warmup, my eyelids were shutting down and I was practically standing there in a trance, not knowing what to do for atleast a minute. I decided to pack the warmup and do some jogging/running /whatever I could manage. Now, I might have been an unusual sight to the fellow runners in the stadium, but for atleast 3 laps(1.2km), my eyelids were open ever so slightly , just to avoid colliding with anyone and I think I was kind of meandering on the track, but I couldn't help it. After the third lap, I felt a bit fresh(refreshed from this kutty nap) and I ran strongly with my eyes wide open for another 4 rounds before calling it a day!