Work that you get done at the last minute is still work that you get done.
Still, I'll share a few tricks that have worked for me. Not every trick works every time, but usually one will work.
I say to myself, I'll do this one thing (check my e-mail, or write one response, or read a chapter in my current book) and then I'll work on my work for at least 20 minutes. 20 minutes is great because it's long enough to get something done, but not so long I feel I'm spending my whole life on it.
One day I wrote down everything I did for the whole day, right after I'd finished it, and I found myself doing things just so I could add to the list.
Often, if I have a whole day to do something, it won't get done because I feel I have plenty of time, and so procrastinate the day away. If I only have half a day, I get to it because I know I only have a limited amount of time. This is why I do housework on workdays and not days off.