ooh, i think i know the answer to some of these lol
big bang: i believe the big bang theory and evolution.. in that theory, it just says how the earth was formed... there were unstable gases and such and an explosion occured in space, drawing matter that was already in space into a concentrated area, essentially forming earth... however, like desan said, it doesnt explain where the matter in space came from.. my take is that someone or something of a higher level (?) put that matter there so it can react
Colors: people all see the same colors lol... all of our systems, including the visual system, are built the same.. the rods in our eyes are sensitive to light... and our cones are basically responsible for color vision... basically, different colors are just different frequencies of light waves.. so when the frequency for red hits the cones in your eyes, it will interepret the frequency into the color that you see... so if you stood in a room with someone.. and were shown a picture of the color red.... you guys will be looking at the same frequency of light... and since you guys are of the same species (humans), your rods and cones work exactly like the other persons rods and cones, meaning you will both see the same color (same structures interpreting color + same frequency of light = see same color)...... and just a fun fact.. color blindness is just a deficiency in the rods and cones
Sleep: time doesnt past faster when you sleep.... when your asleep, your conscious mind totally goes away and your unconscious emerges (dreams)... what keeps track of time is your conscious mind... but since its dormant when your sleeping, there is nothing in your body keeping track of external time, so when you wake up, it feels like time just flew by because your conscious mind re-emerges, and picks up where it left off (before you fell asleep)
HUZZAH!