The title pretty much says it all, really. DD does 3 or 4 hours but then wakes every hour afer. She does feed for about 10 mins each time so she could be hungry, but I've tried keeping her awake to fill her up in the hope that she'll go longer but she goes straight back to sleep while I lie there awake, just get to sleep and she's up again. Tried shushing & stroking, no dice. Is this the growth spurt? Been going on 4 weeks now.