Full black-out windows solution / Up-pointing lights

1. I am looking for a solution that allows me to FULLY black-out the windows when it is time to sleep. My colleague spent $15k on automated curtains, but maintenance/cleaning is quite a chore. Heard there's this new technology that allows windows to be "tinted on demand". Is there really such a thing? Otherwise, is there any other value for money solution? Don't mind getting from Taobao and have it installed by local contractor. 

2. I'm thinking of installing LED lights that point upwards to the ceiling, so as to create a soft glow effect and remove direct glare from the naked eye. How do I do that without the trouble of accumulating dust on the ceilings? 

Otherwise I may consider using diffusion panels (something like Samsung store in Vivo). Will that be expensive?

Thank you so much!