I used to take Benylin years ago [well, still do sometimes] and couldn't understand why, when I was feeling better the bottle still called to me, until I understood more about the contents. A lot of Nurofen products contain quite potent ingredients [in fact, if I'm going to have a busy day but am feeling tired I take those tablets containing pseudoephedrine, which is a stimulant]. Once took some late at night when I had a cold and was awake half the night.