Puffiness under the eyes is a common symptom of allergies, lack of sleep, stress, and poor diet. Eyes will become puffy when the skin around the eyes becomes irritated and itchy. People who consume large amounts of alcohol and sodium before bed may wake up with puffy eyes due to water retention.
Alcohol, Benzodiazepines, Barbiturates and other central nervous system depressant drugs act primarily on a neurotransmitter substance known as GABA (Gamma Aminobutyric Acid). GABA is an inhibitory neurotransmitter that makes other neurons less likely to activate.
While being metabolized, alcohol is distributed throughout the body, affecting the brain and other tissues. Within minutes of being ingested, alcohol reaches the brain and initially gives the temporary impression of being a stimulant. Alcohol goes on to act as a depressant and a sedative, producing a sense of calm.