The idea at twenty to seven, in the shower, is gone by ten past unless something catches it. That is not a memory failure. Early morning is a particular state, and it evaporates the moment the day's traffic starts moving.
Which is why a notebook beside the bed is not an affectation. Insight is not scarce; it is badly stored. People who appear to have three good ideas a week are usually just the ones who wrote down the ones they had.