4 month old Lab puppy + almost-5-year-old struggling with boundaries — normal phase?

I’m hoping to hear from others who’ve been through this, especially families with young kids and puppies.

We have a young lab puppy (still very much a baby). Overall she’s sweet and social, but we’re navigating some challenging interactions with my almost-5-year-old.

When we first brought her home, she had to be tethered almost 24/7 because she constantly tried to play rough with the kids. Over time, this has improved a lot. Now I can let her be loose and she will leave the kids alone for the most part.

The main struggle now is when she becomes overtired or overstimulated.

Some of what we’re seeing:

• She jumps mostly on my son, not adults • My son tries to hug her around the neck, touch her ears, and plays very rough despite repeated reminders • If she jumps on the couch with him, he will sometimes shove her off • She grabs onto his clothes and tries to rip at them during play • She also counter-surfs and grabs food if a kid walks away (working on management for this) 

When Luna is very tired/overstimulated, she can:

• run at me • growl • jump up • occasionally bare her teeth • be extremely wiggly and sometimes slam her whole body into my legs 

When I put her in her kennel during these moments, she lays right down and passes out within a minute.

She does not bite, doesn’t latch on, and the behavior stops once she’s separated and allowed to rest. It feels frantic and overstimulated rather than focused or intentional aggression, but with young kids in the house it’s understandably concerning.

One thing I’m also struggling with is teaching her to relax in the living room. She will not lay down or nap in there at all — she stays alert and restless — but she will relax and sleep when she’s tethered in the kitchen or in her kennel. I’d love any tips on helping a puppy learn how to settle in a busier space like the living room.

I know a 5-year-old isn’t developmentally great with impulse control, and we’re actively working on boundaries and supervision, but I’m curious:

• Has anyone else experienced puppies reacting more intensely to kids than adults? • Is this kind of overtired/overstimulated behavior common at this age? • Any tips for helping a puppy relax in common areas? 

Mostly looking for shared experiences and reassurance from people who’ve been there. Thanks.