Found an article from the internet.
Tips for getting a good night's sleep:
Cut down or eliminate caffeine - tea, coffee, soda, and chocolate in general are all stimulants; it's best to avoid them whenever possible, but especially in the late afternoon and evening
Create a sleep atmosphere in your bedroom - curtains that block out the light, keeping the temperature lower than the rest of the house, and most importantly leave your worries on the other side of the bedroom door!
Take the time to unwind - do not exercise for at least 2 hours before bed. This includes housework! Take this time to read a chapter in your book, listen to relaxing music or just talk quietly with your partner.
Avoid the pizza and pickles - spicy or acidic foods can cause heartburn and indigestion. If possible have your main meal at lunch time, and go for the smaller lighter meals for dinner. Allow yourself 2-3 hours to digest your last meal.
Make an appointment with bedtime - try to keep your bedtime routine the same. Going to sleep and rising at the same time every day, will help to train your body in good sleep habits.
Don't lie there - if you're having trouble getting comfortable or falling asleep, instead of getting frustrated, get up. Have a bubble bath, read some more of your book, have a glass of warm milk. Give yourself some time then try again.
(
http://www.pregnancyweekly.com/topics/sweet_dreams.htm)