The talk above is by Giulio Tononi, of the University of Wisconsin on “Sleep function and synaptic homeostasis” – stop yawning at the back! Its about 20 minutes long and is comprehensible for around the first 5 minutes.
I have been dieting lately, restricting my calorie intake to somewhere around 1500 calories* per day. I am using the H-plan® diet – where the H stands for hunger: basically the idea is to avoid panic when I feel hungry and just get used to the feeling. Well I am losing weight (of which more later), but the diet has had a side-effect: I don’t need as much sleep. I know that after eating a big meal I would feel especially sleepy, and I wonder if this is just a re-bound from having previously eaten too many large meals?
Normally I sleep for just under 8 hours but crave for more. Currently I am sleeping for 7 and waking refreshed. I have looked on-line for explanations, or corroboration that this is a genuine effect and found nothing. Why I should feel the need for corroboration of something I am experiencing is something else I don’t understand! But even though it appears to be just me, it certainly lifts my mood.
With my current surfeit of wakefulness, I came across a discussion on Quora about sleep, linked to a talk on YouTube (see top of the page) addressing the fundamental question: What is sleep for? Hearing the basic facts of sleep read out (about 1 minute into the talk) it seemed amazing that we don’t have an answer to the question. Sleep is central to our lives – both personally and as part of of our symbiotic relationship with our spinning planet – and essential to our health. And yet we not know the answer to something so basic as ‘What is it for?’. Wow.
I was reminded of the role of the Sun in our lives. Our lives and cultures are based around the action of sunlight on the Earth, and yet we never look at the Sun directly – it would damage us if we did so. Similarly with sleep, because we lose consciousness during sleep – it evades our gaze.
*1 calorie is a dietary unit of energy approximately equal to 4200 joules.