Can NyQuil Cause Memory Loss?

Can NyQuil Cause Memory Loss? Nyquil falls under a category of over the counter sleep aids called antihistamines, which are used to treat allergies. While Nyquil can knock you out relatively quickly, it may not be what you think it is. First off, it can have some pretty nasty side effects. Sedation, confusion, memory lapses, and sleep fragmentation are a few. Antihistamines also disrupt REM, or dream sleep, which can affect your memory, mood, and attention. While not addictive, they can be habit- forming, and build a tolerance quickly, causing you to need higher doses. The best way to use a sleep aid like NyQuil is occasionally when you're feeling under the weather and can't fall asleep. If you're dealing with insomnia, it's best to start trying to get better sleep by practicing good sleep hygiene. Having regular bed and wake times and avoiding screens before bed can help more than medication.