Light is a very important factor that triggers sleep.
In fact, it is exactly the opposite. What triggers sleep is darkness, and especially the absence of blue wavelength in light.
This is a real problem for over-connected people like us today, because all our electronic devices use led light which is mainly in blue wavelength.
Brain requires at least one hour before starting to produce melatonin after being exposed to blue light.
If we want to have a good sleep, we need to stop watching TV, computer or phones/tablets one hour before going sleep.
Bluelight filters can be helpful.
True. I use f.lux on all my devices for this purpose.
Highly recommended and so comfortable.
https://justgetflux.com/