Ambien, generic name zolpidem, is the most commonly prescribed sleep aid, accounting for 85% of prescribed sleeping pills. It also ranks in the top 15 on the list of most frequently prescribed drugs in the country. Its popularity is clearly due to its efficacy. Zolpidem works as a hypnotic drug, meaning that it induces a state of unconsciousness, similar to what occurs during natural sleep. How does it do that? Zolpidem affects chemical messengers in the brain called neurotransmitters, specifically a neurotransmitter called GABA. By affecting GABA, it calms the activity of specific parts of the brain. One of the areas in the brain that is affected is the hippocampus. Along with other regions of the brain, the hippocampus is important in the formation of memory. Because of this hippocampal involvement, 

zolpidem can cause memory loss, especially at higher doses, an effect colloquially referred to as “Ambien Amnesia.” If you take it and do not go to bed immediately as recommended, this is more likely to occur. When you get right in bed after taking it, a loss of memory is inconsequential…it doesn’t matter if you can’t remember lying awake for a few minutes before falling asleep. But there are many reports of people taking it and remaining awake and out of bed, and they commonly experience an inability to recall subsequent events shortly after taking it. Because of its effects on memory, there is some concern that zolpidem could affect long-term memory and contribute to the development of dementia or Alzheimer’s disease, though there has been no research to prove or disprove these possible associations. Zolpidem comes with a host of known side effects that range from weird and wacky to illegal and downright dangerous behaviors. Included are hallucinations, decreased awareness, disinhibition, and changes in behavior. Very serious problems may occur when someone who has taken zolpidem gets up during the night. They may exhibit very complex sleep-related behaviors while under the influence of zolpidem. These might include relatively innocuous sleeptalking, sleepwalking, sleep cleaning and sleep eating, to more disturbing behaviors like sleep cooking and sleep sex, to potentially deadly sleep driving. While in a confused state, a person on zolpidem may act in a way that is different from their normal waking behavior. This can lead to legal consequences, such as driving under the influence (DUI) or potentially even sexual assault charges stemming from disinhibited sexually charged behavior. 

I have a long time patient named Deanna that takes zolpidem and regularly sleepwalks, also known as somnambulation for the Scrabble set. It happens that she has been a sleepwalker ever since she had the ability to walk, so being on the zolpidem now makes her nocturnal activities and behaviors really way out there. Just flipping back through her chart, I see she mentions: taking apart electronics and trying to put them back together with no success. Dumping all of her shoes out of their boxes onto her closet floor. Taking all of her clothes off their hangers and throwing them over her dining room chairs. Gathering all sorts of disparate items together, evidently whatever catches her eye at the time, and putting them in her oven. She said she learned that particular lesson the hard way. This one is whacked. She started “painting” a wall in her house….with a purple sharpie. She showed me a picture of that. She once found several pages of her stationery scrawled in words she knew she didn’t consciously write in a letter to someone, she didn’t know who. She brought that in. She said she would evidently clean in her sleep; she put shower gel all over the tile in her shower and “put things away” in odd places they didn’t belong in. She also sleep eats. Cereal, bread, ice cream, whatever she sees that looks good I guess. She regularly wakes up to a mess in the kitchen and destruction in the house. It used to really freak her out to see the evidence of activities she didn’t remember, but now she just feels unsettled as she surveys the damage from her night time escapades. But since it hasn’t ever been anything dangerous and because zolpidem works well for her, she doesn’t want to change it. 

How is it that a person on zolpidem can achieve these complex behaviors while unconscious and asleep? It’s because the parts of the brain that control movement still function, but inhibition, consciousness, and the ability to create memory is turned off. Because of this, the person is disinhibited, and that can lead to unintentional actions and behaviors as discussed above.Beyond zolpidem’s effects on memory, awareness, and behavior, there may be additional issues associated with its use. Some other common side effects include: