I first obtained this sleepy fetish when 16, watching an old serial on late night TV called Panther Girl of the Congo. The heroine, named Phyliss Coates, was knocked out in almost every chapter or scene. This had a real effect on me, very arousing.

Oh yeah, I loved that movie! I first saw it when I had just hit puberty in the early 1970s. Fun stuff!

Unlike most here I'm no comic buff, but randomly enough it may have been a comic scene that triggered the fetish in me. This one - http://sleepycomics.com/6847.

The combination of Lyja's implied gasp, creatively illustrated by the "*" (dramatic flair of sorts, uncommon and interesting to my young mind!), combined with her and Susan's legs in their short explorer shorts are the elements that did it for me.