what in nyquil makes you sleepy

NyQuil contains a blend of ingredients that can induce sleepiness, making it suitable for nighttime use to relieve cold and flu symptoms and help with sleep. The main ingredients in NyQuil that can cause drowsiness are doxylamine succinate, an antihistamine, and dextromethorphan, a cough suppressant. These ingredients have the potential to cause drowsiness and sleepiness, with doxylamine succinate being the primary component responsible for inducing sleepiness. It is important to note that NyQuil should not be used long-term as a sleep aid, and it is unsafe to drive or perform other activities that require alertness after taking NyQuil due to its sleep-inducing effects.