Dreaming is a state of restless sleep, likely due to blood sugar dysregulation. I find when I'm not sleeping well(taking a while to fall asleep, etc) I would dream automatically, and it'd usually be some form of nightmare.
Do you eat before sleeping? Maybe you eat something crappy then go the day feeling bad without eating and this happens.
Time is passing so quickly. Right now, I feel like complaining to Einstein. Whether time is slow or fast depends on perception. Relativity theory is so romantic. And so sad.