Waking Up in the Middle of the Night...Boo! :(

You're still 21 months old, and recently you've been waking up in the middle of the night, normally between 1-4am. :( It's strange because you're not unhappy, but you will wake up crying to let me know you're awake. When I go in there, you usually are standing up, with your cup. You hand the cup to me and say "mulk." :) I pick you up and take you downstairs, get you some milk and then you go right back to bed. Not sure how to keep that belly full of yours. You're still not eating very much - we might just have to do Pediasure drinks at night or something.