Thank you for your query on Healthcare Magic.
This episode after fall from sofa is looking like an episode of loss of consciousness
with a seizure
Due to hit on head the child might have developed brain injury
such as concussive injury or some times bleeding inside.
I advise you to consult the emergency as early as possible for the examination of the child and for investigation with CT scan
brain to look for internal effects.
Hope I have answered your query.