Is it milk or water?
DD1 has insisted on sleeping with a water straw sippy ever since switching to a big girl bed. It's like a lovey to her! I don't have a problem with it, at least until we have her give up sippies for good. After all, I always keep a glass of water by my bed too.
I'm having a similar issue.... We've cut out sippy cups during the day, much to DD's dismay! She's been using the Nuby soft spout and it has basically become her pacifier. She sucks on it all night long (water only) and gets upset if she wakes in the middle of the night and can't find it. All this from a baby who never used a pacifier! Ugh
Anyway, cutting it out at daytime was a pain. She went on a food & drink strike for 4 days! She refuses to sleep w/out it and I think nights are going to be even more of a power struggle. I think we're just going to have to do it cold turkey and have her throw them out and just be gone!
I kept saying that we'd do that as soon as she turned 3...a week ago. But between sicknesses in the house and us not sleeping well, it looks like we'll be waiting a little longer. Especially since she's so adamant on having that darn cup.
Ideally, we'll keep a straw cup by her bed in case she gets thirsty at night. The problem for us it more using her cup as a paci.