I've had similar when very tired, in the days before the BP was an issue. I was on exercise with the Army and hadn't slept in 24 hours, when I saw a parade of black and white minstrels walk past, and then ten minutes later a bright yellow NY Taxi. Get some sleep and see how you feel. Please though, if you're feeling that level of tiredness, have a nap before driving home as tiredness can be as bad as drunkness when driving.
A year after that Army exercise, I was on another one, in a ditch with another guy at night when a figure dressed like a Medieval knight came past. I assumed it was my mind playing tricks on me again so kept quiet until my colleague said 'what the bloody hell was that.' Turned out he'd seen the exact same thing. Really odd!
I hope it sorts itself WireTwister and that you start getting some sleep. Tiredness is a terrible thing and affects the mind dramatically.