Took 150 mg benadryl. 20 mg melatonin and nyquil. I cant keep my eyes open but also cant sleep. Its been 6 hrs. Can I take more benadryl? I Need sleep

Will not likely work. There is something else causing your insomnia and another 50 mg Benadryl will not likely do the trick. Instead it will just increase the intensity of any potential side effects (dry mouth, constipation etc). You will need to find out the cause (trying to problem solve, anxiety etc). If this problem persists, you will need to consult your doctor. .