Ideas come and go, and if you don't catch them when they come up, they may be gone for good. You may never come up with the same idea again, the same thought.
It helps to have ways to capture your ideas on the fly—doodling in a sketchbook, jotting down notes in a notebook, or recording a voice memo on your phone, for instance.
Eventually, most ideas tend to come back, though, especially the ones related to your current situation and circumstances. An alternative strategy, in fact, is only to capture ideas that recurrently make it into your head.
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