I actually did that when we were transferred from Gt Lakes back to San Diego. I got up filled the coffee pot, plugged it in and couldn’t figure out why I didn’t smell coffee. I didn’t put coffee in the basket. Just water in the pot. It was my first experience with a sleep aid and it backfired. I was awake the entire night. GAH!!!
I had coffee in it. At least I hadn’t turned the timer on without putting the water in - that would have ended badly.