system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why there's a sense of motion even if you're lying still when you're drunk.

Like when you hit the bed and it seems like it's moving around.
gpt
The spins happen because of an odd effect alcohol has on your ears -- specifically, on three tiny, fluid-filled structures called the semicircular canals. Inside each of these canals is a fluid called endolymph.
As you move around, the movement of the endolymph lags behind the more solid cupula, distorting and bending it -- and those little hairs. When the hairs bend, the electrical signal they send to your brain is altered, helping you to make sense of the rotations your head experiences on each of the three planes the canals sets.

LPT: Looking at a fixed object and keeping your feet planted on the ground can help lessen the effect.