ya wanna know what? that same thing happened to me. i was starting a new job a couple years ago, and i was feeling a bit shitty, so i took nyquil the night before i was supposed to start working there. i was up for five days. besides that fact, i was jittery and my eyes were wide open as if i were surprised at the fact that my jaw wouldn't stop jigsawing from side to side. i stayed up all night, uncomfortable, and i haven't been the same since. no, i'm okay now, but i don't take nyquil anymore. just thought i'd share