Sleeping problems in the first trimester?

I am in my 7th week of pregnancy and since day one I have been having issues with sleeping. In the past 7 weeks I have maybe gotten 3 days of a full nights rest with no interruptions! I have been going to bed anywhere from 9pm to midnight and waking up 2 to 4 hours later on the nose and wide awake. It boggles my mind as to why this is happening so early on! With my last pregnancy I couldn't get enough sleep and with this one I can't seem to be able to sleep much at all. Not to mention I wake up at some points when I am able to sleep, sweating horribly. I have not gone to the doctor to discuss this with him yet because he wouldn't see me until I was 8 weeks pregnant and even then he was booked until I am 11 weeks pregnant. Is my sleeping problem a normal thing this early on in pregnancy?