By surveying trees via a 3-D technique known as terrestrial laser scanning, scientists have determined that trees have sleep cycles.
These sleep cycles have to do with the transport of water from the ground into the leaves, something that was previously believed to be a constant process. However, these Danish and Hungarian scientists have determined that there is short-term change in water transport, which makes the trees move, sometimes up to 10 centimeters.
These tree studies have been going on for some time, and you can read more about them in this 2016 article and this more recent article!
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