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Nytol and ECA

Last night I took some Nytol because my sleeping pattern has been erratic and I want to get it back on track. The active ingredient in Nytol is Diphenhydramine HCl, same as Benadryl. Then I took an ECA stack this morning before my cardio to get me going. Is this a bad thing to do because I felt a little light-headed after my cardio?