I'm getting confused by my little girl, she's going to be 4 months August 2nd. Lately ahw gets so cranky between 7 or 8 so we start to getting her ready for bed and she passes out almost immediately, then she sleeps all night (which I'm trying not to look a gift horse in the mouth here.) But I do mean all night, she was asleep and in bed at 8 last minute and it's 7:40 now and she's still sleeping. She's refusing long naps during the day which is killing her dad and I. She just takes 30 minute cat naps, sometimes a 1 hour nap. Is this normal? Should she be sleeping like that at night?

Pic of her cuteness