Not sure how much conditioning this is but I tend to be more focused and task oriented in >4000K color temperature. I can't really stand residential settings >

Not sure how much conditioning this is but I tend to be more focused and task oriented in >4000K color temperature. I can't really stand residential settings >2700K (unless it's some isolated work room like a garage, laundry etc). So the people that work on that lighting design stuff seem to know what they are doing, at least for me. It doesn't help with the desire to actually go to bed, but another anecdote is the darker the room the better the sleep. Most window dressings are decorative and designed to be somewhat translucent. Add a blackout cellular shade or curtain. Eliminate any displays, cover power LEDs etc.