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.
Thus, if a person does not drink for a couple of hours, then the body will automatically bring the BAC level down by 0.30 percent. Therefore, a person who had a BAC level of 0.50 percent will take around three hours and twenty minutes to clear the alcohol out of their system. Thus, now you can do the calculation yourself about how long does alcohol stay in your system.