Fashion should not turn off just because your eyes close at night. Not to scare you, but what if something odd happens and you're forced to run outside? Or, what if your favorite bed buddy surprises you at 3 a.m.? I'm not suggesting wearing a cocktail dress or stacked bangles to bed. I'm merely saying if it's comfortable and cute, but not marked sleepwear, wear it anyway.
Like this Only Hearts Metallic Skinny Tank ($66). It's not a traditional pajama, but how shiny would you look sleeping in it? Live a little, even in your sleep!