The Sleep School ran a test in a school in which a class of 11 year olds were tested before and after being given guidance on improving their sleep hygiene. The class was averaging 7 hours sleep a night before the guidance and 8 hours after it (which is a big improvement although it is advised that this age group should have 9 to 11 hours).
The results in the cognitive tests were:
Focus and attention: +44%
Problem solving: +61%
I was not surprised that there was an uplift in performance but I was surprised at the extent of it.
The other benefit (from a US study) was that sleep deprived teenagers eat an average of 9% more calories and crave more sugar and starch. This equates to an average weight gain of 4 kilos per year.
To watch the programme go to: