It probably depends on how blantant people are being. I would honestly think that if your flight isn't crowded, and you aren't disturbing anyone, the flight attendents are going to let you alone.
If the flight is crowded, then well, it'd be stupid to try it...
Use common sense.
Red eyes were always good for that purpose.
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Free your heart from hatred. Free your mind from worries. Live simply. Give more. Expect less.
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