I am similar with lack of sleep. I am 22+5 now and get 3/4 hours on an average night. I work in an office, so no summer holiday :(
I try all sorts. Last night I had a bath, I have just had a milky drink, didn't eat late, and kept myself busy during the day, but still awake now.
I think the only thing that gets me longer sleep time is going to the gym, but I am too tired to do that every day.
So second best is to not panic that I am not sleeping and try and rest whem I can.
I have also been taking my pregnancy vitamin tabs again in the vain hope that making sure I am getting the right iron and vitamins will help. We shall see.
It would help if dp didn't keep coming to bed at 2 or 3 in the morning, he knows that is my witching hour! But working on that.
Sorry for no great words of wisdom, just try not to worry about being tired, it will only wind you up.
Also try going to bed earlier and getting up for a couple of hours in the night before going back to bed. That is my next plan. I might try to do something like bake some cakes!
All the best and congratulations on your pregnancy.