For the last week or so Phoebe has been a lot more alert and has been awake for most of the day. However today all she has done is slept, she had a really good night last night only woke once for a feed instead of her usual two. She had half a bottle at half 7 (she only had 2.5oz) and fell asleep again til half 9. All she's done is sleep and feed all day and she's only had two feeds since half 9 this morning. She's fell asleep on every bottle too and slept all the time inbetween. Is this normal?