Oh yes, we all have our days. I was doing a paper pieced block the other day and didn't tuck the fabric under when trimming the extra. I cut my piece right off! I was kind of ticked off when it happened. But must admit I laughed hysterically when I did it a 2nd time. A while back I was appliqueing hearts for a baby quilt. I was trying to work assembly line and when I picked up a set to iron, I didn't realize I had another one clinging to the underside. Also didn't realize it the next 2 times...I have 3 heart applique shapes outlined on my ironing pad! LOL
I have such little time to work on my sewing that I hate to stop when I'm tired, even when it's probably better to do so. :)