Not all trees sleep the same – High temporal resolution terrestrial laser scanning shows differences in nocturnal plant movement – Research – Aarhus University – Trees Sleep! and have equivalent of heartbeat!

We confirm the existence of overnight “sleep” movement for some trees, but conclude that circadian movement is a variable phenomenon in plants, probably controlled by a complex combination of anatomical, physiological, and morphological factors.

Source: Not all trees sleep the same – High temporal resolution terrestrial laser scanning shows differences in nocturnal plant movement – Research – Aarhus University