Trouble sleeping already!

Diane • DD aged 9.5, DS aged 8, and DD aged 1.5 DH aged 33 expecting a baby boy January 2017
Im going to be 28 weeks this Thursday. I'm really having trouble getting to sleep. I do think there is too much going on in my head, not serious stuff or stress, just all the crap I read daily on social media, it's hard to switch off. I guess I should try and take a break from it to see if that helps. Anyone else having trouble getting to sleep?