I should make a habit of turning off my PC. I leave it on if I'm downloading a large file (of course, public domain).
My spouse leaves his workstations on, but as he works at home, and is on call on occasion 24/7, I do not see the $ saved on electricity as a win for us if it takes him seven minutes to boot up for a client whose need is so urgent that my spouse must be taken out of bed at 3:15 a.m.