A few years ago (long enough that the points are long gone) when I got a ticket through they included a list of excuses/mitigation that wouldn't be accepted.I’m not sure I’d offer sleep deprived in mitigation if I was you.
Pretty sure being tired was on there. So was both "I was familiar with the road" and "I was not familiar with the road".
I considered writing "I thought I'd get away with it" but decided they probably wouldn't see the funny side.