Thank you for your query,
The swelling could be due to a cephalhematoma
which may be present since birth.
It will take some time to completely subside.
As your kid is active, healthy and feeding is normal nothing to worry.
In next follow up you can discuss with your Pediatrician
about this. But ant associated problem with this swelling you can consult your Pediatrician.
That sleep and feeding pattern is normal for newborns.
Hope I have answered your query.