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The longer we stay awake, the more we need to sleep, scientists say External link icon.

The titular statement is hardly groundbreaking. If that’s all there was to it, I’d have discovered it myself and I’d have a Nobel Prize on the mantlepiece (rhetorically, that is, because I don’t actually have a mantlepiece).

Two years ago, scientists in Japan reported the discovery of a mouse that just could not stay awake. This creature, which had a mutation in a gene called Sik3, slept upwards of 30 percent more than usual: Although it awoke apparently refreshed, it would need to snooze again long before its normal lab mates’ bedtime. It was as if the mouse had a greater need for sleep.

I know how the mouse feels.

Scientists are doing more than stating the obvious of course: they’re looking at why we need sleep at all.

One theory is that while we’re awake we form strong synaptic connections in the brain, which make memories, and during sleep we ‘file’ these memories. We weaken the synaptic connections related to unimportant memories and strengthen those related to important memories.

But what’s going on at the cellular level?

It’s all to do with proteins and a process called phosphorylation, which is the binding of phosphor and oxygen to organic molecules.

I think my own brain is faulty in this respect, or at least it can’t distinguish important memories from unimportant ones. I'm likely to forget something important, like maybe a hospital appointment, yet remember useless details about an obscure, late 70s punk band.

I have to use an extensive system of electronic reminders to remember anything these days. I find placing a single reminder is insufficient and I have to add an additional reminder reminding me I’ve got a reminder to attend to.