Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do you ever want to sleep again?

I bought this after reading the label for ephedra and anything else I thought would be problematic. I had very few qualms--it's One A Day, after all! Talk about an established brand! After taking them for three days I had one whole night of sleeplessness! Although I've never been sensitive to caffeine before, I guess the amount of it in these vitamins is so high that I spent the most miserable night, just trying to get some sleep. I think consumers should be warned much more of that possible side effect. I threw mine away.