Both ZzzQuil and PURE Zzzs help your body move from light sleep into the REM sleep cycle, which is your deepest and most restorative sleep, and also where you dream. The longer you stay in the REM sleep cycle, the more you’ll dream, and the more you’ll remember those dreams. However, while your dreams will likely be more vivid, you should not have terrifying dreams on ZzzQuil. If you do experience unwanted, frightening dreams, try practicing calming techniques before bed. If you still experience unpleasant dreams, discontinue ZzzQuil use and talk to your health care provider about a sleep aid that will work for you.