diphenhydramine (benadryl) is not a good sleep aid in my opinion. studies have shown that this antihistamine interferes with rem (rapid eye movement) sleep so you are not sleeping as deeply or as restful. there are much better sleep medications by prescription. this is a high dose. not only does it dry out your mucous membranes it will wear off in about four hours. see your medical provider and have your insomnia treated more appropriately.
i've been taking 75 mg of diphenhydramine at night for insomnia--is that a dangerous level to take?