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An apple right now? Five
Millennium Falcon when I'm about to sleep? 1-3
Can I control my imagination enough to go through all the motions of a bolt action rifle reload cycle? No
Sounds like hypnogogic hallucinations
That is also a thing and explains the most vivid ones you only remember when something startles you back to fully awake.
But mostly I meant for me it greatly varies by the situation and what I am trying to imagine.
Interesting, I have aphantasia and yet I have both hypnogogic and hypnopompic hallucinations on occasion. Other than those I never remember dreaming, although I almost always wake up thinking of the same thing I went to sleep thinking of. And when I do have waking dreams / hallucinations it's always of whatever I was thinking about. If I realise the hallucinations aren't real they immediately fall apart which is a shame, as I don't normally get to experience any kind of mental imagery.