I have a 35 wk preemie who is now 6 wks old. Spent 12 days in the nicu for fast breathing and learning how to eat enough to not need the nasal tube. Finishes a bottle and immediately starts acting tired, goes from one yawn to fussing to freaking out in minutes. Then takes up to 30 min to fall asleep. Since she is developmentally 1 wk old, is this usual behavior? Just started pat/shush as she got used to rocking to sleep.