Dear in pregnancy,due to harmonal changes, bulging uterus,you may not get enough sleep,try these steps,hope it helps you..
Drink warm milk,before bed,it will promote you a good sleep
Take bath with warm water,before bed,so that you will have an peaceful sleep
After dinner,make a habit of walking 15 min, regularly
During bed time,listen to good music,or read good books,it will make your mind relaxed and promotes good sleep