When I'm sick Nyquil has little to no effect on me also.... my son was home from college all week and of course was sick the entire time.....I got it on Wednesday and drank an entire bottle of Nyquil in 1.5 days..... Drank 4-5 doses from 5pm to midnight..... was up at 6:30 on Thursday...... drank the rest of the bottle over the course of Thursday and was never sleepy..... stuff is overratedChugging Monster makes a difference, yeah?
I think I'm the only person I know who takes Nyquil and still can't fall asleep immediately.