Yeesh, I can hardly remember anything deliberately, these days. But if someone else mentions something (like Moog said about contextual cues), it seems to unlock a door and then lots of stuff can spill out. (And it can even be hard to stop, sometimes.)
Actually, I find a lot of my brain's functions seem to work that way. In the past, I increasingly tried to force my brain to do what I wanted with deliberate effort, but it (my brain) kept resisting (was like trying to push a mule that doesn't want to move; the harder you push the more it resists; but if lead the right way, it can work out).
Or, it's like not having a pilot light (as on an old gas stove). Most people have one, so when they turn on the burner it lights automatically. But in my case, I can turn up the gas, but often nothing will happen unless someone/something brings in a spark. (But from then on it's fine.)