Buzz
After a night of heavy drinking, you finally settle down to sleep, only to feel the room spinning wildly around you. What causes this unsettling phenomenon?
The sensation of spinning occurs due to alcohol's peculiar impact on your inner ears, particularly on the semicircular canals. These tiny, fluid-filled structures contain a substance called endolymph and a gel-like formation known as the cupula, which houses cells covered with delicate, hair-like stereocilia.
When you move, the endolymph fluid shifts more slowly than the cupula, causing it to distort and bend the stereocilia. This bending alters the electrical signals sent to your brain, enabling you to interpret rotational movements of your head across three planes—up and down, side to side, and back and forth—and maintain your sense of balance.
Alcohol disrupts this delicate system. It thins the blood, and when alcohol-infused blood reaches the inner ear, it causes a density imbalance between the cupula and the fluid in the canals, distorting the cupula's shape. This bending of the tiny hairs sends a false signal to your brain, making it believe you're rotating even when you're stationary, creating the illusion that the room is spinning.
Many actions you might instinctively take while heavily intoxicated, such as lying down or closing your eyes, can intensify the spinning sensation. Without visual or physical cues to counteract the false motion signals, the feeling worsens. Focusing on a stationary object or keeping your feet firmly on the ground may help reduce the effect, but there's no guaranteed way to completely stop it.
