The effects of zolpidem can also last longer than one night, leading to drowsiness the following day, which can in some cases make it dangerous to drive. Long after it was approved for market, research emerged that women given the same dose as men were more likely to suffer morning drowsiness. Eight hours after taking zolpidem, 15 percent of women but only 3 percent of men had enough of the drug in their system to raise their risk of a driving accident.
