I go to the allergy section and get the generic Benadryl. I go to Sams and get a big bottle. It's easy enough to sometimes take without water. I have the same problem with my sleep cycle. I can be exhausted but come around 7-9 PM, I am wide awake and can not go to sleep. Right now most nights my Klonopin puts me to sleep but sometimes I have to revert to the Benadryl or even an extra Klonopin. I even have an old script for Lortab that is my last resort. Last night it was after 4 AM that i finally went to sleep and that was after 75 mg of Benadryl.