I can only speak for myself...
My twins were my third pregnancy. My first two were singles. So, in comparison to those pregnancies, yes, I slept and felt exhausted in a surprisingly intense way. I did feel better once I eliminated sugar. I was having some blood sugar issues. As long as I kept my water and protein consumption high, I felt much better.
But I do think it's completely normal to need a lot of sleep and feel exhausted...your body is doing a whole lot!
It is completely worth it though : D I love waking up to two little happy babies smiling at me in the morning...it's all the thanks I need.