A Google search does reveal science supporting the idea. So, for those who get the munchies and that tend to spend their evenings on their PCs, there's a simple way for you to find out.
Here's a link to one of the many articles that discuss the blue light effect:
https://www.webmd.com/sleep-disorders/n ... our-health
And here's a link to a free PC-based blue light blocker app:
I'd installed this app' some time ago based on a friend's suggestion regarding the blue light affect on sleep - that it tends to keep you awake. (I didn't notice any difference, but then I very rarely have problems with sleep.)
I've no idea how you'd do this with other sources of evening blue light like the TV or overall room lighting. Seems that, if this works, you'd be motivated to find out!