Dynamic lighting usually has to be motivated, for example, rippling light from a pool of water, etc. In a bedroom, blowing drapes/sheers are a good idea but I'd probably add the extra element of blowing leafy branches in front of the light as well. A 2K is pushing it in terms of being a bright-enough light outside the window if this light-dark modulation is going to be the key light of the scene, but it may be enough for a night scene, as if from a warm streetlamp for example.
I find that skinny pepper tree or bamboo leaves to be better for dancing shadow patterns rather than a broad leaf plant.




