Many moons ago I worked for a night freight outfit. A very explosive job!! I used to drive home at night very tired. I used to pull in at motorway service areas and recline the seats and take a nap, but only for 20minutes, set on an alarm. I used to use the freight parks because there were drivers of HGV's doing the same and it was dark and quiet. One early morning I pulled into Fleet on the M3 and parked behind a large HGV. I woke up from a deep sleep to see, out of the windscreen,the tail lights of said HGV as he was preparing to move out, duly illuminated and 6 feet from me ! The brake pedal was straightened out eventually and it took 3 trips to the dry cleaners to get my trousers clean and I never tried it again