Insomnia

Hnz
I'm not even 6 weeks yet and have been having difficulty staying asleep all night. It's not even to use the bathroom. I wake up around 4 am wide awake and extremely hot Eventhough I leave all the windows open. And then I can't go back to sleep for the rest of the night. 
Is this occurring with anyone else? I hope it doesn't last all pregnancy :/