Some advice - do NOT take ambien unless you are familiar with what it will do to you. I had a friend take it on an overseas flight to London and she has no recollection of anything, along with the fact that they had to wake her up when she arrived at the gate. She was groggy for many hours after.
Also, Calcium Citrate (Citrical) has been shown to increase consistent sleep for those experiencing frequent "wake-ups" in the middle of the night. Take 2 tabs around 5 pm and 2 tabs around 9 pm.
If you feel you won't be able to sleep, and want good effects, take 1 Tylenol pm with 400 mg. of Ibuprofen around 9 pm. Relax in your bed watching TV/leisure reading (or whatever you like to do), and you'll be out by 10 without ANY side effects by 5 am. The benadryl in Tylenol PM lasts only 4 hours, so that is plenty of time to flush from your system.
Also, do NOT eat spicy food, i.e. pizza, taco bell, etc. For supper, eat a salad, protein such as fish or chicken, rice or potatoes, and fruit for desert. Before taking your "meds", have some vanilla pudding (not chocolate) or yogurt.
Good luck to all!