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Dribbling is caused by over-production of saliva coupled with rebellious lips, and can be easily prevented by sewing a large piece of cotton wool to your tongue.
Many pensioners dribble while sleeping (see Naps, Afternoon) and this can lead to dehydration if the sleeper is not awoken within a couple of hours.
Many famous people have dribbled, including Jackson Pollock, Red Rum, Guy Fawkes and Disraeli, and Norse legend includes the giant Slerpnig, who dribbled a fiord while sleeping on a glacier.
Dribbling is rarely serious and only one person in Honiton has ever died from it.