
What makes us fall asleep - a boring lesson, a dull conversation or something else? Apparently, the longest a person has gone without sleeping is more than 11 days; that must be incredibly boring - staying up all that time while others sleep. I personally love a good sleep - an escape from the daily routine.
Back in the 1960s, a scientist called Ian Oswald did some research into people sleeping despite experiencing stimulation. Oswald took 3 men in their twenties and pried open their eyes with tape (keeping them moist with steam), placed electrodes on one of their legs which administered a painful shock (causing the leg to jerk), placed bright flashing lights in front of the mens' eyes and to top this all off, they had to listen to loud Blues music - what a delightful relaxing way to spend a night in!!!
Within about 10 minutes, all the men were "asleep". The pupils in their eyes constricted, their heartbeats slowed and their brainwaves (measured by an EEG) showed characteristic sleep patterns. The subjects also admitted that they felt like they had been asleep.
Oswald went further with his experiment. He took 2 new men and exposed them to the same conditions excluding the electric shocks. This time however the men were to bang their elbows and tap their feet in rhythm with the music. This time, the men fell into "micro-sleeps"- short periods of up to 20 seconds where the brain went into a sleep pattern and the men stopped moving. Shortly after, they awoke and began to move their limbs again. During the experiment, the men would fall "asleep" up to two times a minute.
So monotonous rhythmic sensory stimulation is enough to send people into a sleep. Habituation by the brain to monotonous stimulation causes the brain to shut down as opposed to becoming aroused. Maybe the organisers of Formula 1 racing should take note - loud noise, flashing colours and lights and a monotonous parade of cars isn't enough to stop most people falling into a sleep!






























