Is this normal?? Cluster feed/dream-feed?

My baby and I have been working through some poor latching--shes 3.5 weeks old and had been taking a bottle of pumped for 1-2 feedings from Dad (until we were advised not to, and went back to breast only)

We were getting better with the latching, but 2 days ago she regressed--unlatching & going shallow/nipple-feeding. Yesterday we had pretty steady nursing throughout the day (every 2-3 hours on demand, with some longer comfort sucking here and there).

Come evening (7pm on to midnight) she was cluster feeding like crazy, wanting the boob every few minutes even though I felt drained and empty/soft. She finally stopped nursing & comfort sucking around 12:30am.

I tried to wake her with a diaper change at 2:30am but she was catatonic! She never sleeps that hard...she also didn't cry or murmer throughout the night, when she usually grunts up a storm! She didn't wake me for a feed by 5am, so I put her to my now engorged breast and she nursed well.

My question is: is this normal? Did this clever little one cluster a sort of late-night dreamfeed to tide us all over for a long sleep?? Typically I wake her up to nurse every 3hr. at night because she doesn't seem to stir on her own, which concerns me too.

Any similar experiences? She's been gaining weight (6 lbs. 15 oz. at birth to 7 lbs. at 1-week, 8lbs. this week) and having 6-8 wet and/or poopy diapers each day.

Any advice is helpful! Thank you