Ummm...yes most definitely!

I had it in my first labour and there's about 2 hours of that labour that is just one big bluuuur. Lucky I have another 16 hours of it that are clear as crystal
Peth knocked me for six - Basically for an hour I was passed out cold on the bed and according to DH I sat bolt upright like someone rising from the dead with every contraction, and passed out again when it was over. Over and over for an hour. I have only the vaguest recollection of this.

My second labour I didn't rule much out but the one thing I told my DH was laid in stone was NO PETH! It just wiped me and made me feel sooo out of control. Horrible