Why does the bed spin after a long night at the bar?
The vestibular system is a complicated network of passageways and chambers within the inner ear that work together to control equilibrium and balance. Inside there are tubes and sacs that contain different fluids, each of which has a different composition. When you are healthy and both sides of your vestibular system are functioning properly, the two sides send symmetrical impulses to the brain. When you get very intoxicated, the alcohol changes the density of the blood, and this affects the intricate system of balance. That is when the spinning starts. This is similar to the condition called vertigo.