My night time essentials are:
-A diaper, I've developed a bit of a bed wetting problem over the past couple years, so they are sort of essential.
-Jammies, or a onesie, because I like feeling adorable.
Plus I move around a lot, so this way my diaper tapes don't get pulled off.
-My favorite stuffie, Duk Duk. I usually have a bunch in my bed, but Duk Duk is essential. And take him (discreetly) pretty much everywhere.
-My super soft and cute blankie.
-A baby bottle full of water. (Although after seeing these comments I might switch to chocolate milk) -And my Pacifier.
Even when I go somewhere overnight, I make sure I have a room to myself or just get a hotel room, so I can still have all the "essentials". And the very rare time I can't, I always bring my stuff anyway. It comforts me a little knowing I at least have Duk Duk nearby. Even if I can't bring him out.