Don't think this is a real issue at my work place.
If the cabin lights are turned down they are usually done to their penultimate setting so that there is sufficient ambient light remaining for safe travel within the cabin. After all the airline does issue sleep masks for a reason.
On landing/take off at night they will normally be turned down to the lowest setting to ensure rapid acclimatisation to outside lighting conditions in the event of an evactuation.
You may want to post this in the Cabin crew forum as they'll tell you if its an issue or not.