Cool as a Cucumber

My mom would always say this when a fever broke. Don't know where she got it but it's just what she said. Also don't know if it's common or not. I've never really heard anyone else say it.
Any how, that's what Ian was this morning, cool as a cucumber. He was still asleep when I left for work this morning but I had to go in and check on him before I left.
Jeffrey said he's doing great today except for the congestion and sneezing. He slept until 10, which is fairly late for him. Jeffrey was already up, showered and dressed before Ian woke up.
I'm so glad he's doing better today.