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I have found the National Institute of Mental Health website to be by far the most informative for any questions I have about my diagnoses.

Hypervigilance is a state of constant arousal. You are constantly looking over your shoulder and all around you for potential danger and if any is detected (either real or imaginary) a fight or flight response usually ensues.

Hyperfocus is the ability to focus on a singularity, be it a book, video game, daydreaming, person, etc. at the expense of everything else going on around you. When in a hyperfocused state, it may take several attempts for someone to get your attention. The joke around my house is that when I am in this state, a bomb could go off next to me and I might look up and go, "What was that?"