My baby is 4 months old and she just started doing this. I know she's tired and it's like she's fighting it, but she flares her arms around and kicks and whines. I also can see her eyes roll back in her head and she wiggles almost violently, then she's out cold, asleep that is. Only does it at bedtime. And she usually sleeps for 7 to 8 hours then. Anyone else's baby do this? Is it normal? Is she just fighting going to sleep, but is very tired?