Try not to worry too much.
Yes, it's easier said than done, but lying in bed worrying about not sleeping is a guaranteed way to make things worse. "I had severe insomnia with my last pregnancy. I tried everything imaginable, and nothing worked. For me, a consistent bedtime routine was the best bet," notes SMDJTD. "Worrying about not sleeping always makes thing worse. My strategy is just to lie in bed and not worry about not sleeping if doesn't come right away. I just try to think calm, pleasant thoughts, and focus on how comfy my bed feels. I simply relax and tell myself that if I can't sleep, I'll just enjoy resting. After months and months and months, I'm finally falling asleep within 15-30 minutes of hitting the pillow most nights."