16 week old schedule

We have a 16 week old lab. When we first brought him home he was pretty great at sleeping through the night, only the odd middle of the night wake-up.

But in the last 2 weeks the middle of the night wake-ups are becoming more frequent. They’re not every day, but still enough to make me question what I should be doing to make him go back to sleeping through the night. The middle of the night wake up times are random. 1am, 2:30am, 4am. Sometimes just pee. Sometimes pee and poop. I know my evening schedule needs work so open to feedback.

Current schedule:

6-6:30am (ish) – wake-up, potty

6:30-8am – play, breakfast around 7:30, walk, training etc.

8/8:30-10:30 – nap

10:30-12:30 – play, training, lunch around 12:30

12:45-3 – nap

3-4:30 – play, walk, training etc

4:30-5:30 – shorter nap because his stomach starts dictating for dinner

5:30-6ish – dinner

6:30/7ish – nap because he turns into a terror around this time

Now this is where I come unstuck and have read so much conflicting advice. We aim to go to bed around 10ish so take him out for final potty around 9:45ish.

Should I be waking him from his 7pm nap or letting him sleep through to final potty? I don’t wake him from his daytime naps, but maybe I should be waking him from his evening nap to have 45-60 minutes of him being awake calmly with a chew toy?

A note to say I’ve tried a mixture of letting him sleep through from his evening nap and waking him up but can’t see a clear correlation. Is it just him being a puppy or can I do something?