Hi all – I received my FIR sauna yesterday and used it for the first time last night. I have to tell you, I felt WONDERFUL when I got out of there; reminded me of when I was a teenager and spent the day at the beach in the sun. This morning, I am sooooo achey, even moreso than usual. Is it normal to herx about 12 hours after the sauna? I’m even on narcotic pain killers and they are not helping!