Grayscale on Electronics

I was watching the Today Show Monday and they were talking about not being addicted or as addicted to your smart phone.  One of the suggestions they used was to change the screen to grayscale.  And it is true:  the screen is much less interesting and does not stimulate the pleasure centers as much.

I began thinking about it.  I have begun watching the original Perry Mason shows on TV.  These are the old ones in black and white.  And, I find that even if I do not watch the show closely, by the time the show is done, I am lulled and ready for bed.  It makes sense.  First of all, it is the lateness of the night (10:30 PM.)  But it is other things:  the repetitive music, the absence of loud noise, usually, and the boring black and white scenes.  Even when the plot has twists and turns, I still am usually ready to go to bed after the show.  

Maybe grayscale does have sedative or at least, non-stimulating properties.