Frontiers | Quantification of Overnight Movement of Birch (Betula pendula) Branches and Foliage with Short Interval Terrestrial Laser Scanning | Plant Biophysics and Modeling
http://journal.frontiersin.org/article/10.3389/fpls.2016.00222/full
Interesting new research into circadian rhythms in trees which seems to confirm that trees sleep.
[However, they could have got the Latin name for Betula correct in the original paper.]
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