Insomnia in early pregnancy. Any advice?

So I'm 5 weeks pregnant, yay, ? but for some reason for the past few days I've been unable to sleep. I've probably slept an average of 4hours/night. I'm worried this is going to affect my baby, since it's very important to get a good nights sleep in early pregnancy. Anyone else going through this? Does anything help get you to sleep? Any advice would be very appreciated.