The things I will never understand

I will never understand why my kid will only sleep in her car seat? No...not if we are in the car, but just at home in her car seat on the couch.  The last couple of days she has been only wanting to sleep in her car seat and no where else.  I have tried rocking her and then putting her down in her play pen or crib and she just wakes up and cries.  I have tried putting her on our bed on top of a piled up comforter (which she normally likes) and that isn't working either.  I have even tried holding her for 3 hours and she still wakes up and fusses.  So, yesterday I was frustrated with her not sleeping and put her in her car seat to try to fold some laundry and she fell right to sleep...ugh!!  Now, it seems like I have to pull the car seat out just for her to take a nap!  And once she is in there...she is OUT!!  I even have to wake her up to feed.  

I just don't get it and I hope this isn't going to become a habit!  :P