[giantg2]

Eliminate diuretics at least after lunch, like caffeine and alcohol. I would also recommend drinking more water throughout the day (vs other drinks). Reducing sugary consumption at least after lunch can also help.

Physical activity can also help. My theory is that it can help sitting at a computer all day can sometimes cause me to retain fluid and that it's the retained fluid that is being processed when lying flat. If you notice your calves/feet/etc being slightly swollen this could be a sign.