4 week old sleep pattern

Alexandra
Moms of 4-week old babies or moms who can recall what their babies were like at 4-weeks, what are their sleep patterns like? 
My son is 4 weeks old and sleeps pretty well during the night -- he usually sleeps about 3-4 hours at a time with one night feeding and goes back down again easily.
However, his day time sleep is all over the place. From what I understand, he should be sleeping at least one hour in between feeds and shouldn't be awake for longer than one hour. A lot of times he won't sleep in between feeds (so he will go 3 hours or so being awake).
Is this normal?