I don't like the English term procrastination at all: it sounds terrible, although maybe it's good for such a harmful phenomenon. I still prefer our native word "procrastination".
Now, in the era of widespread use of MRI for human research in general and higher nervous activity in particular, scientifically based articles and books are beginning to appear about where the delay came from.
This is not the topic of this note, so I will say only one thing — it is conditioned by our biology itself, no more, no less. And the more terrible it is to fight it. However, this can and should be done.
Today I will offer you just one method that helps me very well simply because it does not require any thinking and logical calculations. That's how, in a hurry, the delay is easiest to overcome.
What I suggest you do: when your hand reaches out to move any task to a day, week, month - put it aside, take the next task on your to—do list and do it without interruption for just fifteen minutes. I suggest using a timer (any: clock, mobile phone, "tomato" or computer). The priority of the next task, importance or urgency does not matter at all. The only important thing is the fact of your work, work without prior reflection or desire.
You don't do the task that caused your resistance, and thereby calm your instinct, but you do what you have to do — and your instinct will help you in this, because our nature will easily agree that jumping into the water, you need to flounder to swim out.
And at the end of this fifteen minutes, you will easily begin an important task for you that you were going to postpone quite recently. Over time, you may not need such an exercise, because the habit of doing what you have to will be with you.