You don't use lightbulbs after sunset in your house?
Or your phone?
The mentally stimulating part is definitely part of it, but not all of it.
There's also the question of how bright the screen and proximity to your face - versus ambient lighting.
Your pineal gland is definitely affected by light, just close your eyes and shine a flashlight right at your "3rd eye".
I haven't watched a single video on this btw, just used my friend's in the gym and was intrigued.
For 20$ I'm going to conduct the experiment myself.
If it improves my sleep schedule I win.
If it doesn't it costed me nothing basically.