plants sleep?

so i came back from my cousins house and after eating dinner at serangoon.
i stopped to stare at the full moon.
the lock does not open by itself. and the key was not present at that moment.
so getting bored by staring at the moon. i shifted my attention to the rose pot.
i told my grandma that there were two buds on its way to blooming and i may have touched it ever so gently, i wanted a closer look.

and she reacts in a somewhat surprisingly protective manner.
in broken english she says that the plants are sleeping.
verbatim- "aye(aa)! the plant is sleeping!"

i smile in spite of myself.
she chides me as if i had just disturbed a human being while it was sleeping.
its only 10, the plants go to sleep at 10??
she carries on to say that i didn't read the 'book' so i won't know.
she gestures with her hand trying to make me understand.

i get it now. she had the greenest fingers i have known so far...
we have a whole row of plants outside our house and she waters them and tends them daily
i have to respect their sleeping times. and listen to her.
if not they won't look as good as they do.
sorry atta!