The lack of sleep adds to the susceptibility of said illusions also, well rested mind would handle such mind games a bit better...I thought i had gnats but I could never catch them, friends, family And google search had me thinking so also with that delusional bug syndrome til I got pissed at google search and typed 'f off, I'm not f'n crazy, where are these gnats coming from...and what ya know in the middle of all the ghost gnats was one article about fungus Fanta, yeah never heard of them, and it took me right to the potted plant with old top soil that was infested with gnat larvae....eww, and hell yeah, screw yall knew I wasn't nuts...then I got super hacked and they thought I was crazy again, til apple had to admit it :D