Personally I procrastinate when I am not confident of my future in general. A person can procrastinate when depressed.I know because I have depression and it varies. When I am less depressed I plan more for the future and i procrastinate less. I feel that in my case it is not a rational process but rather it is a mode of operation that the mind puts itself into conserve both mental resources and physical resources. I have to point out that your English is perfect in your post.
RE: Questions to ask yourself on procrastination