J.E.
I agree - don't stress. At 4 days they really do sleep a lot. I have a lazy eater and a sleeper (she was sleeping through the night at 3 weeks). We could strip her down naked, flick and tickle her feet, zerbert her belly, and NOTHING woke this child. What ended up working for us was to take a wet wash cloth and wipe her down from head to toe. The cold air hitting her body usually did the trick. She was mad, but she was awake, eating and gaining weight which was what was ultimately most important.
With latching, nothing I tried worked until I started placing my thumb on her chin and gently pressing down so that her mouth was open wide enough to latch properly. She would start trying to suck before she was even on the nipple, so I'd patiently wait for her to stop and then try again. From the first time that I started doing this, I connected words with it ("Open big.") She is now 7 weeks and she understands what this means and will open wide enough to latch properly.
Hang in there and relax. The worst that can happen is that she'll be a bottle baby and many children have grown up just fine being bottle fed. It really does get better!
J.