Bellegar is the ultimate troll.
He is that.

I'm still finding evidence of more mischief now on my third play-through: I found the three sleepers, the strangely-named Nightwinkle and friends did actually return to Broken Valley village after all where they described that their ordeal started when "a weird, rhyming fellow gave us a bottle of wine"! Prior to that I'd assumed it was just a random encounter rather than a Random Act of Bellegar.