The most prevalent side effect of Ambien is drowsiness in the morning. Most people are tired, sleepy, or drowsy the following day after taking the drug. This incapacitates your ability to perform activities of daily living, such as driving or going to work.

To reduce this risk, only use Ambien when you have a chance to sleep the entire 7 to 8 hours. Do not use it late in the evening or while driving unless your doctor says it is okay.