You're right, taking care of yourself is essential to better manage situations and have the energy you need for your daughters. Improving your sleep and diet is an important first step.

It's difficult to advise you on what to do. But I have some perspective on the situation since I don't live it. So as far as sleep is concerned, I've noticed that when the temperature in my bedroom is 14°C, I sleep really really well.

As for food, I sometimes practice batch cooking. This allows me to prepare dishes for the whole week. I do that on Sundays.

It's rare that I do it now. I used to do it when I was studying. Now that I'm freelance, I work from home and that takes a lot of the commute out of my day.