Oooh. I took my usual bedtime meds last night and added in Simply Sleep, which is just diphenhydramine, to avoid lying awake for hours before finally falling asleep. I did fall asleep quickly, but awoke in the middle of the night horribly dizzy and faint. I was so dizzy this morning that I felt sick. Scary. Proves my belief that all diphenhydramines are not the same. I'm used to taking ZzzQuil and have never had any problems with it. Simply Sleep is going in the bin.