Our short-term memory is very short. Experts vary in their opinions from 20 to 30 seconds. To me, 10 seconds does not make any difference.
Anytime you have an idea, remove all judgment, desire to analyze, need to evaluate, etc. WRITE IT DOWN! Use a sticky, a napkin, a text message to yourself, email yourself the idea, call yourself and leave a message…you get the idea.
Confucius, a very famous Chinese philosopher (c. 551-c. 479 BC), said, "The palest ink is better than the most retentive memory." As such, "If you think it, write it."