If your LO wakes up to nurse once in the night, what time is that nursing session? Is it pretty regular? And how old is this LO?

DS is 5 months, and he goes to sleep around 7:30 or 8pm and wakes up anywhere between 10:45pm-3am to nurse, then sleeps pretty well most of the time until 5 or 6am. We're going to sleep train soon, so with the unpredictable wake-up to nurse, I wonder if I'll know whether to go in to nurse or implement the sleep training method (a modified Ferber).

I'm wondering if other babies who nurse once a night nurse at regular times or if it's as irregular as mine. Thanks!