It's far easier than you might think to maintain awareness of all your conscious content.
Why? Because the majority of what you call "consciousness" is an illusion, is not really there.
It's filler.
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What you see when you turn your head? Filler.
What you hear when you're not really listening? Filler.
What you feel when you're not really feeling? Filler.
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Once you see the filler content of consciousness, see what a brittle illusion it is, there really isn't much else going on in here.
Just a few tidbits of information at any given time. There's much else you're somewhat aware of, on some level. But consciously? No.
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It's just very clear that without actively noticing, there is nothing to notice. It only shows up when you do.