Oh yeah, normal....my kids exhaust me sometimes just from watching them!!
One thing I try to do when it's totally noisy and I feel a strong need for some quiet time is I get out play-dough, paints, books, or crayons and print pages off the internet for the kids to color. It's cool to them because they can choose their pages (which you can find thousands of just by typing "coloring pages" in a search). So, if you can find activities for them to do, they'll have their calm moments too. Just please don't be one of those moms who thinks their kids are so hyper that they need put on meds. Kids are supposed to be full of life and an overabundance of energy. That's what makes them so amazing! So, enjoy it, and use their playfullness to your advantage by creating some special moments that they'll remember forever. I think a lot of times, kids seem too hyper simply because they're never made to do enough one on one activities like coloring and reading. Give it a try, you never know!