So mine are 3 and 5 and nap time got renamed to "30m quiet time" after lunch, in their beds, which 70% of the time turns into 2 hour nap time. Luckily my wife and I switched our roles again so after work I cook/clean. Seeing both sides of the fields I no longer pull the "I'm too tired" shenanigans. If I do, I do "dad cooking" by ordering pizza and breaking out paper plates. Either way, my wife needs her evenings off. It really did take me being at home with my kids to see my wife as not lazy and just over burdened.
People, when you are late-20-something mid-30-something, you still need "me" time no matter who you are (I believe this applies no matter age, but there seems to be a perception to the contrary). As I said, I take the evenings after work with the child care so my wife can get her 'me' time, then Saturdays I go hike a mountain for some relaxing times, Sundays we do family events. Sometimes it's precleaning for the week, sometimes hiking a trail as a family and teaching the boys about plants and edible berries, sometimes it's city walking and shopping, sometimes it's doing nothing but catching a movie and detoxing. Either way, we are constantly trying to balance family, work, and ourselves time. And schedules are never locked, they are fluid. Sometimes I need to work late, sometimes I need to go have drinks with co-workers, sometimes she has Saturday plans. We work around it together.
Oh shit I've gone preachy, carry on... (my wayward son)