What to do

Yes I don’t think she wanted him to go either, but I am not thinking it’s due to poorly baby or they’d have said unlikely to go out tonight. I think she just doesn’t like him going out so was tracking him.

if this was about poorly baby then they’d not have firm plans for tonight.

Well yes....I am speculating that the poorly baby was mentioned as this was something she was hoping the husband would notice and say he wasn't going out to help. I get the overall feeling she didn't really want him going out.

The baby can’t be so poorly as she was planning on going out tonight and letting sister in law baby sit, and she’s not saying she’s staying in because of the baby.

I strongly suspect she didn’t sleep as she was tracking him, and because he didn’t go back to his sisters till late, she’s had no sleep, and hence she wants to punish him.

She’s unhappy in her relationship and she has very young children. And he’s a human. Start there and do better.

The post isn't about this and doesn't mention her being unhappy.

It's hard to unpick what she wanted by this post though (which she even states) other than the possibility of being tired and cancelling their plans tonight.
There are lots of things that could be assumed - poorly baby - did she ask her husband to stay home for help instead of going out? Did he offer?

By going out and staying at his sister's what time was she expecting him home. This seems to be the main issue in the post - she is saying she is tired through having a bad night with the children, but this would have always been the case as surely her husband wasn't going to go out with the other dads, stay at his sister's and return home in the morning before 9am, especially if he had been drinking and was going to be driving back.
I do imagine the checking his location would have caused more of a sleepless night and I don't know why she would have been doing that though.

Absolutely, for some the woman can never be at fault and they see it as their role to support. The best way to respond though is honest and unbiased. Because otherwise you risk supporting an abuser. Even if they don’t realise they are one.

there is no difference to the op when he got to his sisters, he was never coming home last night, her level of tiredness is not related to him going for a late drink to someone’s house. Unless she’s not been honest and she just stayed up to track him.

as such, it looks like she is controlling and wants to punish him,for having a good time.

and that always needs to be called out.

Either have a nap when he gets home or tell his sister that the baby is not well enough for you to go if you’d rather rest up at home.
If my DH was going out on a rare night out when ours were small (16 month gap between the 2 oldest ones) I would ask that he stay over at his mums, brothers etc essentially anywhere else but home which would involve him trying to come in quietly, miserably failing and waking up the entire house, so I don’t think it’s odd for someone to stay elsewhere.
We were the first ones within the family/friendship group to have children so someone was always happy for him to kip at theirs.
I do think it’s a little odd you can track him, the only people I track via their phones are my secondary age children, and then I only check it if they are running late or I want to see how far away they are so I know when to get tea ready etc my DH and I have never tracked each other via phones, it’s pretty intrusive.

I'm not sure there'd be so much navel gazing going on if this was a man tracking his wife, threatening to cancel their plans and asking if he can trust her...

Ok…
when @Burningbud1981 said that if OP was struggling with the things that you made up that she should have put them in her OP you replied with -

“It’s not necessary or helpful to sneer or laugh at a woman struggling.”

Referring back to your made up narrative.

She’s unhappy in her relationship and she has very young children. And he’s a human. Start there and do better.

Ok, I’ll start there. The OP is punishing their husband for not doing what they want which is controlling (arguably abusive) behaviour. There is nothing at all to suggest the unhappiness is anything other than a result of their own actions and lots of people have very young children; it’s not an excuse to behave badly in a relationship.

It’s ok to not like being called out.

I didn’t realise this was going to be a educational session but I’ll point you in the direction of Google and there you will find the answer to any side or version of a discussion that you want. Whether you agree or not, will be subjective.

Nope. Didn’t refer back to it. Quote where I did. Thanks.

I said ‘it’s likely’, not that she was. Because fear of infidelity and/or resentment at a partner having a night away does not drop out the sky from nowhere.

You being ‘bored’ of the ‘MN standard’ (and women are individuals btw, not a homogenous ‘standard’) does not warrant using eyerolling, laughing face emojis or calling whatever she might say as ‘bullshit’.

She’s unhappy in her relationship and she has very young children. And he’s a human. Start there and do better.

Yeah, made it up.
And then referenced back to it.
Like if I said it’s likely that you have a dog and then I refer back to your dog…

I said ‘it’s likely’, so no, I didn’t make it up.

Then the can do so in a sincere manner, and not with eye roll and laughing face emojis. Can you explain what is either compassionate or helpful in using those emojis in order to express concern or help?

I laugh because it’s MN standard. The post isn’t going their way so they come up with a BS drip feed. And you’ve completely made up that she’s unappreciated btw. She’s being unreasonable. She knew the husband wasn’t coming home so he hasn’t moved the goal posts. She’s punishing him he went somewhere else. That is not right and she needs to be told so.

You do know you completely made up the part about OP being unappreciated, don’t you?

I don’t see the comment as sneering or laughing. Sometimes people need to know that their actions have consequences and it’s not healthy for any relationship to need to stalk and check up on a spouse. Either there is trust or there isn’t and if there isn’t, the relationship has far more issues than the OP being tired.

It’s not necessary or helpful to sneer or laugh at a woman struggling.

Well then she should have put that in the post.

So he was staying out all night anyway? Even if he stayed at his sister's he'd be unlikely to get home at the crack of dawn. You'd be on your own anyway and just as exhausted. Do you think he'd be less hungover if he stuck to the original plan?

By that do you mean ‘overwhelming majority disagree with OP on board literally called “Am I Being Unreasonable” and you had nothing to add of any substance but couldn’t stay quiet either’?
Nobody has been nasty…

I agree. I feel like there's more to this underlying. Sounds like resentment has crept in somewhere along the way.

Do you have any advice for the OP or is this going to be the total sum of your contribution to the thread?