Meant to come back in here earlier. Just wanted to say thanks for everyone's suggestions. Lots of good ideas.

Tan, I'm a new woman now that I'm doing stuff earlier in the day when she has her nap. Felt incredibly proud of myself when I made a veggie curry by 10am the other day. So I've decided for one-pot casserole/pasta sauce type meals, I'll make them early and just reheat later and for stuff with veggies, I'll slice and dice the veggies earlier in the day. This has made a big difference to my sanity and energy levels - thanks again.