Well, the first time I took it (unless I took a double dose?) I could hardly do anything in the morning, after I took it at night. I remember going into university on the bus having no idea where I was half the time, not recognising where I was. I remember being on the computer writing an email to my friend and being unable to focus and making the font bigger and bigger. I don't remember the rest of the day, but I suppose I must have got home ok (this was 4 years ago).