Benadryl works well.. I take only half the dose so I am not so groggy in the am....
I am feeling the same way. I am almost 34 weeks and I have the hardest time sleeping at night because I just can't fall asleep. I work odd hours, 1-9pm and when I get home at night it is about 9:30pm and I don't get to sleep until about 2am or later....and I am getting up every 2 hours to pee..... When I wake up, I feel like crap and at work I am so tired.
My doctor told me to take benadryl. Its preg category B so its safe, but you can always just call your docs office to make sure :D
They may even suggest or prescribe other stuff for ya.