As human beings, we crave stability and security even though neither exist.
The healthiest people get sick, the wealthiest can go bankrupt and the best relationships all come to an end at some stage.
There is a reason for your brain to want to maintain the status quo explained by the fact that its number one job is to keep you alive.
Therefore, when you get to the end of the day still breathing, your brain considers that a job well done and wants to replicate the patterns that resulted in its main goal.