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.
Still using the two examples above, there would be no measurable alcohol in the woman's body in about 6-1/4 hours, and the man's body in about 2-3/4 hours. Below is a list of BACs and the approximate time it takes for alcohol to leave your system. 1  A BAC of .02 will take about 1.33 hours to leave your system. A BAC of .08 (the legal limit in the United States) will take about 5.33 hours to leave your system. 2  A BAC of .10 will take about 6.66 hours to leave your system. 3  A BAC of .15 will take about 10 hours to leave your system.