Yes PM curves can be useful. For the reason Juls mentioned, cats go lower at night when they are more active. Sometimes, it's the only way to know they drop really low and know the dose needs a reduction.
I did a couple for Wink, sort of. Set an alarm to wake me up.
Teo, from Argentina did a couple when I asked him to for his cat Viamo. Food switch and upcoming long vacation when pet sitter was not originally going to home test were my reasons. So I could "Suggest" a vacation dose and keep Viamo safe.