Oliver has 2 different patterns!
He goes down at 9 and either sleeps until 6, then has a feed and is awake. Or he will have a feed at 4 and then sleep until 7 or 8.
Some days he sleeps all day (literally!) and other days he is awake all day, with a few 10 minute naps. Neither of these types affects the way he sleeps at night.
He is 6 weeks old now and has been like this since about 2/3 weeks.