I've never been suspended, though it is a fantasy. However, I'm prone to feinting and even simply being bound with my arms raised above my head can cause me to suddenly become very dizzy (read: nauseous) and collapse. Anybody who has experienced this will tell you it's the most awful feeling in the world and is compounded by the bondage. So I guess this is a word of warning to dominants and even submissives. Always be aware of circulation issues and, if you're tying with ropes, be sure to learn how to tie quick release knots. Either that, or have a sharp knife on hand for emergencies.