Sunday night we decided it was time for Karter to give up his nightly bottle, and replace it with a sippy cup. With vacation coming up, we thought the timing would work out and it would be better to not have to pack bottles too. It was rough the first two nights, but the last couple have gone really good. He doesn't drink nearly as much milk before bed as he did with the bottle, but he still sleeps the same...so I think he is doing ok! He looks pretty happy with his sippy cup!