Hesitant for no. 2

I have the love of my life, my soul mate as my husband. I am afraid to have a second child and go through the sleepless nights again. However, I know I want more children with him... I'm sure I am not the first who has thought this... how do you get past that? I was just so exhausted all the time and it is so nice to get a full nights sleep with my 2 yo. Help me to get past this, I want to have a second child.