Precursor.
How often did we tell ourselves that we will rest for a few minutes in our car after a long drive, leaving our windows wide open with valuables exposed, only to find out hours later we were in the seventh cloud of sleep having a very nice dream?
Yes, Rest is the precursor of falling asleep.
Thus, precautions must be taken.
Before resting, park your car in a safe area, amid a safe neighborhood. Avoid dark, narrow hidden streets.
Choose a brightly lit area in a major street, full of street life.
Shut all windows except one with a narrow sliver of space left open for ventilation.
Tuck away all valuables from visibility to prevent attracting thieves.
Lock your car in park position - this is actually important for those with history of sleep walking!
Never underestimate the power of Rest.