CC don't seriously tell you (politely or otherwise) what to do with your window blinds do they?
If the light is causing a nuisance why not? Just like if you have 'your' security light shining from outside 'your' property into somebody elses. Or if you have 'your' hifi system making a noise which causes a nuisance to neighbours. The more I think about it the more selfish I think it can be on occasion, especially given the conditions found in economy class.