This is a photo of "walking roots" at night. I had never thought about the silly question of whether walking root trees do their walking at night or during the day. Back on June 25, I posted the lower photo below of walking roots during the day. It is impossible, of course, to determine if the trees are walking during the day or the night, or both. They would have to be running trees rather than walking trees to notice.
The top photo above was taken on the grounds of the Capitan Suizo Resort, located on the beach in Tamarindo. That explains why there is a spotlight on the tree. The lower photo was taken on the grounds of the Cala Luna Resort in the Playa Langosta area of Tamarindo.