I recently read about some studies that have shown light therapy to be more effective in people with bipolar, with less switching, by sitting in front of the lamp at midday rather than the early morning. That works for me, as I hate getting up in the morning and prefer to sleep till at least 9 AM. I haven't had to use my light yet, but I'm going to try doing it around noon to see if that works better for me. I don't work so it wouldn't interfere with a schedule, but it would be hard for someone who works during the day unless they use the light at lunchtime.