I feel depressed only at a particular time of the day like 6pm to 11pm. is this weird? i just started taking anti-depressants sugg by my doc.

Depression and: time of day, month, season of the year, etc. vary from person to person. You may associate that time of day w/particular events from your past or feel isolated as it gets darker. While there is a biological factor involved, a psychological factor is also at play. Consider discussing this w/a mental health professional or prudent spiritual guide. Peace and good health.