Janice used to think her husband's sleepwalking was funny.
He fumbled through the dark, often muttered incoherently, and occasionally
walked into walls. But she stopped laughing when he made his way to the garage
one night and started the car.
Experts estimate that sleepwalking afflicts between 1% and 15% of the
general population. It's more common in children -- especially those between
the ages of 3 and 7 -- than in adults. According to the National Sleep
Foundation's 2004 Sleep in America...