Stage II is the predominant sleep stage during a normal night's sleep. The distinct and principal EEG criterion to establish stage II sleep is the appearance of sleep spindles or K complexes. The presence of sleep spindles is necessary and sufficient to define stage II sleep.
After 5 hours â your BAC would be 0.005. Alcohol would be eliminated from the body at about 5 hours and 20 minutes (the body metabolizes alcohol at the rate of about 0.005 per twenty minutes, as 0.005 x 3 = 0.015). So it is easy to tell when your body will be free of alcohol.
By understanding how long does alcohol stay in the system, you can have a basic idea of how to protect your health and when alcohol will leave your system. Using the metabolism rate for alcohol at .005 BAC per 20 minutes, remember that a single drink will be undetectable in your bloodstream in five hours and 20 min.