How to cut out that evening bottle?? Ideas?

Okay mommies (and dads too!)

I have 11 mo. twins and we have been on sippy cups since 6 mo - so no problems with using a sippy. We use the sippy with each meal (3 a day) and at snack time (late morning and mid afternoon.) But I still give them a bottle right before they go to bed (about 6 oz.) I am wondering when to stop this bottle - I mean completely, and not replace it with a sippy? Did any of you do this, or did you replace the bottle with a sippy - if so how long until you cut out the "night time snack" completely? If I stop the bottle, will they start waking in the night? Anyone have experience/suggestions?

I know it's lots of questions - hope to get some great ideas:) Thank you.