This is a great article: 20 Things To Remember If You Love A Highly-Creative Person.
They're mostly true for me.
I especially liked this one:
16. They often use procrastination as a tool.
Creatives are notorious procrastinators because many do their best work under pressure. They will subconsciously, and sometimes purposefully, delay their work until the last minute simply to experience the rush of the challenge.
When I was working on my masters in education, it entailed a lot of creative work-- writing-- and I was able to submit work to my advisor electronically, which meant pushing deadlines to their limits.
A Monday deadline meant "as close to midnight on Monday as I could get without looking and seeing that the date had actually switched over to Tuesday."
So: 11:42 pm = SEND! 11:47 pm = SEND! 11:51 pm = SEND!
I realized, eventually, what I was doing. It was sort of what #16 in this list says, except I really wasn't doing my "best work" under pressure. What I was doing, though, through my procrastination, was creating an artificial crisis, then rushing to get the work done at the last minute, and finally, once I hit send, congratulating myself for "performing so well under pressure"...
...pressure that I'd needlessly created!
At some point, after about four or five times, I realized this and I thought "You KNOW... wouldn't it be a lot more efficient if I didn't make a crisis out of this, and just did the work and submitted it?"
I don't think I ever pushed a deadline after this.
I think the REAL reason for procrastination, at least in creative work, is that ideas need to fully form. An artist knows this, and procrastination is REALLY an artist's way of letting every possible idea form as fully as possible before it's expressed and "fixed." Because once it's out there, it's out there.