I had jaundice-y babies so had to wake them every 3 hours during the day and every 4 hours at night until that was gone.
One of my bubs was particularly sleepy and hard to wake to feed, but they need the extra feeds to flush it all out.
Once it was flushed though I let them sleep as long as they could - but a pattern was set by then and they seemed to wake like clockwork during the day for feeds and by 4 weeks were sleeping through the night.
Will be interesting to see what this one does.
I have heard that some people without jaundice babies will still try and get the days and nights around the right way, ie. feeding them more during the day, cluster feed in evening and let sleep as long as they will during the night, particularly if they have other children.