So I literally woke up with this thought.
We desire something until we have it.
And I'm probably going to be pondering it all day
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Psychologists call that the Hedonic Treadmill
After experiencing what you desired or dreaded, you sooner rather than later revert to your previous level of happiness. Instead of your normal rising, the shiny new thing becomes part of normal and is no longer exciting.
@BrazenlyLiberal Fits the ADHD mind pretty well though I think there is more to it. For me anyway.