This inability to perceive accurately makes us feel less inhibited. We lose the normal constraints the world puts on us. We miss the subtle cues. It makes us feel free. The brain of the cell picks this up as a problem and changes the cell to correct the problem.
Alcohol tells the brain to go to sleep.
The cells tell the brain to wake up. At first these changes are transient chemical changes, subtle changes in metabolism, which will quickly return to normal after alcohol leaves the body. But if the alcohol keeps coming, the cell produces permanent changes in the cell wall. One way that it does this, is to make tunnels, or chloride channels, through the cell wall. This provides for easier transport of atoms across the cell wall.