Thanks again. I have decided to stop the Citalopram today because it wakes me up every two or three hours and I could not fall sleep again without sleeping pills. The official side effect of Citalopram is only insomnia. But some user of the med on the Internet said that they also wake up every two or three hours. Some users said that such side effect will be gone in around two months, but some said that it never be gone. I could not wait. I may not be necessary to take such ADs because my depression and anxiety is not that bad. I may try St. John's Wort. When taking Citalopram, the Natural Sleep Aid does not work so I still need sleeping pills. The purpose of Citalopram is to increase concentration of serotonin in the brain. Serotonin plays important role in sleeping. Exposing to the sunlight and excercise could increase serotonin in the brain. The oral intake of serotonin cannot reach the brain due to the bloodbrain barrier.