Is it normal to get totally blown out after multiple rounds of interviews?

I gave 4 rounds of interviews and by the 5th (which was with the COO) I was totally blown out. I had barely slept that day too and to be honest I just didn't feel like talking to any interviewers after 4 rounds. I got an email saying I was rejected the next day despite getting to the final round.

Is it normal to get totally blown out after multiple rounds of interviews?
Post Opinion