Yes fully agree with what @temporal said above. I too have a huge Gdrive folder just filled with ideas categorised under b2b, b2c, fun, etc. Jotting down an idea free us the hold it has on your brain and your fear of losing it also goes away.

One side effect of doing this is what i call my ideas are marinating. Something which may sound way awesome at a moment may lose all its appeal in a month's time. So it's good to let your ideas sit for a while anyway.

For me what often works is to immediately note the idea down. My brain stops feeling the need to keep the idea warm in cache if it knows it's safely stored for later.