Concussions. People get knocked out by a blow to the head or neck? They stay knocked out for an hour or so? They wake up okay?
I slipped on ice and cracked the side of my skull into the corner of a dumpster. I was out for...? It was the dead of winter. In Canada. -30. I couldn't have been out more than a minute or two.
I was all kinds of messed up for months. I couldn't control my arms right. My emotions went haywire. I had blinding headaches for weeks.
I still have nasty chronic headaches and memory loss. It happened more than ten years ago!
Knocked out for long enough to wake up tied up in a warehouse? Nah, you died. Buffy? Dead. James Bond? Dead. Sorry.