If my benadryl (diphenhydramine) contains phenylephrine is it not a good idea to take two tablets for sleep?

Drop phenylephrine: Find a product that does not contain the phenylephrine. For most people , that med is stimulating and will make you stay awake, not help you sleep. Make sure you also use good sleep hygiene - bedtime routine, minimize distractions around you, warm milk, and consider melatonon for sleep aid rather than more and more benadryl (diphenhydramine).