Changes in behavior and thinking: Some people using sleep medicines have experienced unusual changes in their thinking and/or behavior. These effects are not common. However, they have included:
• more outgoing or aggressive behavior than normal
• loss of personal identity
• strange behavior
• worsening of depression
• suicidal thoughts
How often these effects occur depends on several factors, such as a person’s general health, the use of other medicines, and which sleep medicine is being used. Clinical experience with Ambien suggests that it is uncommonly associated with these behavior changes.
It is also important to realize that it is rarely clear whether these behavior changes are caused by the medicine, an illness, or occur on their own. In fact, sleep problems that do not improve may be due to illnesses that were present before the medicine was used. If you or your family notice any changes in your behavior, or if you have any unusual or disturbing thoughts, call your doctor immediately.