My baby is now 4 days I an feeding her on demand but she sleeps forever and it's impossible to wake…

My baby is now 4 days I an feeding her on demand but she sleeps forever and it's impossible to wake her up to feed her. my breast fill up so fast that they are constantly sore. I don't want my supply to decrease. I pump so I can relieve some pressure but is there anything else I can do because when I pump it's just wasting milk because she won't take from a bottle