What happened to me?

Recently,
I really don't know what has happened to me.
This afternoon, I came to lab because I wanted to send an email to my lecturer.
I took my paper and walked to the lab.
After a while, I realised that I had forgotten my pendrive.
Therefore,
I went back to take it.
I put my paper on the table and picked up my pendrive.
Then, I went to lab again.
When I was in lab,
I realised that I put my papers on table!

This is not the only time.
This kind of incident always happened to me recently!
Why I am so blur nowadays?