Does guys get tired when they take care of a kids?

Today, my 1 year old nephew came to my house because his mom needs to get her hair done. And usually, I love to spend times with kids, but today, I felt like h**l. I never felt so tired like today. I was watching my nephew for 2 hours and I was so tired. I was so exhausted.<br><br>So I want to ask you guys, do you get tired when you were taking care of a kid?