My LO is now 3 weeks old and had slept about 3 hours at a time since she was born.. But the past couple of days, she hasn't slept more than 30 min - 1 hr at a time. You can tell she's exhausted, but she keeps fighting sleep. I've tried swaddling, rocking, feeding, walking, letting her be... and any combination of those, but nothing makes a difference. Is this normal?? Is there something I should be doing to help her sleep??