You can literally just do it as you get undressed, though I think there's room for this to be "invented" () Wish List of Innovations
This can be good at hotels and places where you don't have your special lighting setup.
⚠️ don't do this with halogen or incandescent bulbs that are hot to the touch.
This dims the light very effectively, and if you have a shirt in the red/orange/pink spectrum, it will also cut out the harsh blue tones. As an alternative, you can make the shift via your eyes instead of the light by putting on orange glasses at night.