In the last days of 2017, I resolved to do my little part to make 2018 better. I decided that I'm going to change, then what I'm going to change and why those things, and how I'll change them.
Two months in, let's see how it's going.
Overeating: I've made some progress. I have done this maybe 4 times, and mostly only slightly.
I still rarely separate the lunch and dinner before I start eating. What helped me get this right was mostly just having made myself the promise of not doing it, and having seriously thought through the consequences.
Sleeping enough: I'm as surprised as you, but I actually made progress! Especially in February,