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30th April 2016
07:17pm BST

Well, according to researchers at the University of Notre Dame, there is a specific reason for this regular occurrence.
It's called the ‘boundary effect’ and it concerns the door we've just entered through.
As reported by the Metro, when we pass through the threshold of a room, the door acts as an 'event boundary' which can cause our brain to immediately forget what was in our mind prior to entering the room.
Here's Neymar to demonstrate what that looks like...
To make matters even more interesting, researchers conducted studies which determined that walking back from where you just came doesn't restore your memory either.
Why is that?
It's because our brain uses memory episodes to retain the plethora of information we receive every second. Therefore, entering a new room or environment often triggers the brain to clear the space and start recording completely new information.
Probably best to just write everything down from now on.
