Do Plants sleep? If yes, how to recognise it?

Question

RMN, India

Answer 1

Some plants do sleep

Answer 2

Plants absorb solar radiation and convert CO2 to O2 during the day as a result of photosynthesis.  That ceases at night and the plants consume oxygen.  Perhaps that constitutes a rest cycle.  However, plants can be grown with artificial light (hydroponics) while most people would sleep even with the lights on.

Answer 3

Sleeping plants would require cognitive plants, which do not exist, so no.  

At least, according to the human definition of "sleep," which requires a REM cycle -- Rapid Eye Movement.  But I don't know -- do plants die in winter, or do they go dormant?  Would a dormancy period count as "sleeping" for plants?

Answer 4

No I don't.