This is not about your sinuses.

Some people clear their desks before they start a new project.  Even those of us who like messy desks clear a work space before we start a new project.  A busy desk is likely to be strewn with debris from old work, bits of pending work, and lumps of work that you haven’t yet figured out how to avoid.  People clear a work space to keep this stuff from mixing into the current job.

A busy head will be cluttered with pieces of things you have just been doing, things you have been meaning to do, things you put off, and things you didn't want to think about.  You can push them into the back of your memory.  You can waste some brainpower keeping them there.  You can wonder why things pop into your head to distract you.

Or you can clear your head.   Gather your thoughts.  As a bonus, you get to relax before you start a new job.

Some people call it meditation.

Self-discipline is an illusion produced by engineering the job.

Meditation.  Also called gathering your thoughts or clearing your head.  It is a simple way to listen to the quiet modules in your head.  The basic strategy is to turn off or occupy your language system so that it does not drown out the messages from the other parts of your brain.  You may do this by chanting, repeating a sound or phrase, focusing on imagery or sensory signals, or simply trying to maintain internal silence. 

Hear the sound of silence
 

Relax Clipit