It’s a mental adjustment. It’s a schedule or routine you and your partner may need to build. All depends on how you keep your domicile concerning the errands aspect.

I’d carve out your productive time or when the creative juices flow and try to get that moment for you setup for the day you’d get. Then have your mindmap, notebook or whatever easily accessible to just note or draw your thoughts on the problems or concepts.

Maybe you can look into alternative sleep cycles (Edison, Tesla, Bell etc) and see if that allows for a you time.

I’ve found looking for news aggregated sites related to your niche can also just give you a little pick me up boost to stay in the know on trends but also gives you content for say a Pocket or repo to gather content to read before bed or another time. Heck even reading it to your young one.

I’ve been combatting this for several years. Once the independence kicks in for them you are freed of things you thought you would never be. Also really neat when they are interested and or can do work while mom or dad works.

About payment problems. If the employer looks to 4 day work weeks it’s either going to be 4-8’s or 4-10’s and if 8’s to stay competitive will need to accommodate for 5-8’s pay schedule. Then there is the pay off of carving out your time to maybe push a side project or contribute for a slice of revenue that could be your play money.