I take 600 mg Seroquel XR at 7 pm with dinner. 8 pm is the latest, or I can't fall asleep until late. Taking it at 7 pm makes sleepy at about 10:30 or 11 pm. Ideally I should fall asleep by 11 or 11:30 pm max. If I don't fall asleep until very late (after midnight) I have a hard time in the morning.

It may take some time to adjust to the medication. Perhaps in the beginning it may seem more sedating than later down the road.