Waiting for tomorrow to come. Because it doesn't.

The illusion of tomorrow is that there's going to be some set of circumstances which makes things you have to do easier than they would be today.

Obviously there's exceptions, like if you're waiting for something to come in the mail so you can progress on a project. But just in general, if you're just kinda waiting to "feel better" or "wait for a nice day" or whatever else you really need to do it today.