All living things adapt to night and day, it's been found. Flowers open in the morning, close at night.
Even ancient researchers found that flowers in a dark cellar continued to open and close.
Now, a team of researchers from Austria, Finland, and Hungary measured sleep movement in trees, using laser point cloudss that calibrate millions of points each.
Trees droop during the night, they concluded. The branches and leaves change position. It's not a big change--but it can be measured.
Two trees were observed--one in Finland and one in Austria.
In the morning, the leaves and branches returned to their original positions in a few hours.
Were they awakened by the sun or their own internal rhythm. The researchers don't know.
Could the drooping be related to water? Maybe. It's part of the research.
And all this is part of life's rich tapestry, isn't it?