Hey S.,
Try Melatonin.
Its natural and its safer than Unisom - although, you're pretty far along so if you were to take Unisom sparingly (one, and not every night) then its probably fine.
I come from an Irish family and drink regularly, and everyone is fine - better than fine. I had a glass of wine every 2 or 3 days or so and things were perfectly normal and safe. If it were me, I'd have a hot bath, a glass of wine and a Melatonin. I'd go to bed with a book or something to read with to wind down - maybe a crossword puzzle.... find a way to calm yourself enough to let everything set in and make dozing off easier. After I'd found what worked for me - I'd stick to that routine like glue.
You can buy Melatonin anywhere, in the vitamins section. Walmart sells it by Spring Valley, but theres lots of makers and its got no side effects.
If you do this - I'd up my intake of Fish oil/Omega 3's by like... a third. If you're taking a prenatal vitamin and nothing else, add 3 Omega 3 capsules throughout your day. One with each meal. DHA in Omega 3 helps brain development, this way you can feel confident that the Melatonin won't do any damage (if it helps you feel better about taking anything.)
I'm at 27 weeks again and a heating pad on my lower back has also helped when I was just too tired or uncomfy to put my big pregnant self into the tub!
Google it and see how you feel about it.