I really hate when this happens. Nothing makes me feel like I'm losing it more than this. I have 3 cats and I'm always thinking its them only to find they're all sleeping 2 rooms over. I also have the flip side to this. I can look right at something and not see it. That's a little un-nerving as well.

I do too, like a shadow out the corner of my eye, i swear i've tried to catch apen that was rolling off my desk only go discoverthere was no pen!

Funny you should ask. I once saw an arm coming through the bathroom door to turn off the light. Thought it belonged to my husband but nobody was around. Everyone thinks I'm nuts but I swear it was there. I've been accusing my husband of gaslighting me. I KNOW I saw it!

I have.

Out of the corner of my eye. Yes, always seems to be peripheral vision.