Newborns often do not have a lot of stamina to nurse for a long time. They are also still recovering from birth and need a lot of sleep. This should all change after about 2 weeks and he should become more alert and also stronger, so he will probably not fall asleep so often when feeding.

The only indicator for these early days is whether he gains weight or not. A baby that gains adequately gets milk, and you have nothing to worry about. So let the midwife weigh your baby to make sure that he actually eats, not just nips and sleeps at the breast.

As others have said before me, breastfeeding is hard for the mother, but it is a relatively short time compared to the rest of your life. First months are difficult because you need to establish good milk supply. This is why I would be reluctant about putting your baby on any schedule right now -- the more often he suckles (not sucks) at the breast, the more milk you will produce and you have a better chance to exclusively breastfeed.

Some weeks from now, when you learn to recognise the signs of a good latch and you are assured that he gains well, you can try to extend periods between feeds.

The best resource for breastfeeding (with videos to see exactly what a good latch is and whether the baby really gets the milk): http://www.drjacknewman.com/video-clips.asp