Maybe this is why You Feel Overwhelmed - Zeigarnik Effect

Incomplete tasks cause cognitive tension that persists until you complete them. 

This is called the Zeigarnik Effect - named after psychologist Bluma Zeigarnik.  

Maybe this is a good thing:

• Better recall of information before an exam
• Immersive experiences with a good book or video game because they create a sense of unfinished business
• More motivation to achieve goals

Maybe this is a bad thing:

• Too many “open” tasks can create more cognitive tension
• May lead to ignoring more important tasks
• Some obsess over completing tasks and neglect health, relationships, etc.

Now that you know it exists.  You choose.