Sleepwalking

I don't believe in parasomnia – plain and simple. It may be as probable as, say, paranoia or insomnia, but – seriously speaking – I ain't buyin' it. I've not had such an episode before and neither have I known any so-called sleepwalkers in my life. After all, how can one be "eating, bathing, urinating, talking, dressing, driving cars, painting, whistling, dancing, committing murder, or engaging in sexual intercourse" when s/he's not completely awake? And, in that sense, define 'half-asleep'.