That is my favorite part about puppies- they play hard and crash hard
Sounds normal to me! Layla will still have days- for example on Monday- was a COMPLETE nut- hardly napped, just wanted to play play play- today- played once outside- had to drag her on a walk- but was "making up" for yesterday and slept most of the day today. Like Patti said, as long as she is alert and engaging when she is awake- sounds like a normal puppy
Enjoy her!