When my 4 year old comes and wakes me up to ask for breakfast, I can't just tell him to go away, even if I only went to bed 2 hours ago because I sometimes have

When my 4 year old comes and wakes me up to ask for breakfast, I can't just tell him to go away, even if I only went to bed 2 hours ago because I sometimes have trouble sleeping. When he asks me to play with him it breaks my heart when I say no because I'm working. I work from home, so I need to maintain boundaries otherwise I'd always be playing with him. I feel terrible that I resent him for waking me up early, and really have to work at reminding myself that I don't hold it against him and that I did get up and care for him, even when I didn't want to. It breaks my heart to disappoint him, but I need to work or he doesn't eat. I also try to actually keep working hours so that I have time to spend with him. Honestly, just meeting your childrens basic needs as well as you can is being a good parent. We can't be there all the time to do everything possible. We're human; we don't have the time or attention. As for the chemical change mentioned, the only difference I've ever felt is I get much more sad when something bad happens to a child, but otherwise, I don't think I think I've changed much elsewise. My heart wasn't bursting with joy when either was born, not to say I wasn't happy.