A recent American study reveals that, after sleeping an average of 7.7 hours, we see the colors that surround us as they are . However, as the day progresses and waking hours increase, our perception of colors changes, and we perceive neutral gray as slightly greenish or slightly pink, depending on the person and their mood.
"Spending hours awake makes us progressively classify neutral colors as if they had a color tone, while sleeping returns us to neutrality in perceptions," explains Bhavin Sheth, a researcher at the University of Houston in Texas, who has presented his conclusions in the SLEEP 2010 conference, held each year by the American Sleep Medicine Association.
