How important is it to push yourself professionally?

I'm super comfortable in life. Really happy, financially well off, happily married and we're thinking of adding to our family as well soon. I do feel like I'm not pushing my self enough at my work place though. I've grown almost too comfortable. Is comfort zone a bad thing? If I push myself a lot, financial gain would be less compared to the feeling of achievement, recognition etc. But at the moment I just love lazying around with my wife way too much. I also feel like if I pushed myself, in a decade I could be at the top in my profession. I'm confused. What's wrong with staying in my comfort zone? Why do I feel like I should push myself more as well? Any advice? Anyone been through this stage already? What's better in your 30s- time relaxing with family or climbing up the ladder? My profession is such that I could still climb up the ladder 5-10 years from now. Ofcourse by then my colleagues would be my bosses, but if I'm being honest I don't like them anyway.