cant sleep?!!! :'(

Amanda • first time mummy, due 29Aug2016 :D
I'm so tired all the time, and yet when I go to bed I sleep only for a few hours and then I'm wide awake :( I woke this morning at 3am so how I'm just in bed like: do I get up? should I go watch TV? I did some reading thinking I'd fall asleep but nothing :( its now 5am. I hope all my pregnancy isn't this way!!!