AIBU to use my headphones?

[relentlesslife]

So I posted about my 2 year old being a giant pain and how my mental health is slipping and I'm not in a good place
A lot of people suggested I need some time for myself. And I agree. So she goes to bed at 7. Once she's in bed I stick my headphones on, find a good playlist or an audio book and chill for an hour.
My husband is against this.
You see she doesn't go to sleep at 7. She isn't distressed or crying, she just sits in her cot and chats to her teddies or sings her abcs or counts. She does this for about 20 minutes and then drops off. Fingers crossed this continues. This is a new thing for her.
I know she's tired at 7. We have eye rubbing and yawning and generally being stroppy.
His argument is what If something happens and I can't hear whats going on.
My defence is the baby monitor is next to me. Literally in my eye line. And whenever she moves it lights up. So if she needed me 2 seconds I'm there. I'm on the same floor as her.

So AIBU

YABU- what a horrible mother you are to have headphones for one whole hour a day, I mean usually I fall asleep 30 minutes in

YANBU- enjoy it. And chill

If the relationship was otherwise healthy, I'd suggest you tell him that if he isn't happy with this window of time you take for yourself, he needs to free up a different window for you by stepping up and doing his 50% share of all the chores. But if the issues with him could fill another thread then it sounds like he's a selfish prick who sees it all as yours to sort.
So then I would say carry on as you are, keep finding coping mechanisms like the headphones to get through and use any head space you do have to think about what you want to happen longer term. It doesn't sound like a healthy way to live or a healthy relationship and my gut says you'd be happier without him, so think about what that looks like, what practical steps you could take towards it.