Don't write down on a running log that you're going to run later in the day because you know it's never going to happen.
Don't NOT run in the morning just because you think you're tired. The run will do you good and you know you won't get it done later in the day.
When you wake up in the morning, RUN. Don't think about it, just go.
In summary: Run in the morning as soon as you get it up if you want to run at all.