>Well, of course they are, but they are moving quite a lot.
Remember the climbing plant planning its get away? (Here: http://ailanreanter.blogspot.com/2011/07/indoor-plants-for-change.html)
Well, it has nicely progressed so far- all activity is transfered into this shoot, the rest is not doing anything currently:

And the Calathea should probably be my big role model… When I get up, it is already in the „awake position“ and now, with the sun still around, it is already asleep: