'WHEN IS THE BEST TIME TO MEDITATE?' - BEST ANSWER

From Taisen Deshimaru in his book Questions to A Zen Master:

"It is most effective at sunset or at sunrise because the cells of our bodies change then. They change twice each day. In the evening we settle, our cells become less active. In the morning they become active again. So it is good to get up early in the morning.  It is very good to practice meditation at twilight and at dawn. It gives us energy, infuses activity into our cells. Those are the best times of day."