When you're sleeping with someone in a small bed and the person on the outside spends the night right on the edge of the bed, or when one partner is too intense with cuddling that the other partner can't get away even when crawling to the very edge of the bed.
"Chris made me play cliff hanger last night because he wouldn't let me have the wall"
"We need a bigger bed. I'm sick of playing cliff hanger at night."
"He was so clingy that I played cliff hanger even in a king sized bed."