Wanting to sleep

Night shift is really getting harder and harder each week. I am so tired and exhausted at the moment and each weekend that rolls around brings me down further. I feel like I spend all week trying to catch back up only to do it all over again. I'm also having such a hard time with insomnia right now and will spend over half of each night awake in bed. It's been taking anywhere from an hour to four hours for me to fall asleep at night and then I wake up constantly. The time I am actually sleeping doesn't really feel like sleep, it's sort of a half dazed sleep. I think most of it is pregnancy related, I know I had insomnia often during my last pregnancy, so I'm trying to patiently wait for this stage to pass... soon I pray.