Everyone who knows me will be sick to the back teeth of me banging on about my insomnia (it’s gotten so bad that I recently tried sleeping like a ‘Medieval peasant’ to fix my Circadian rhythm). But that’s the thing about exhaustion, isn’t it? It ruins your waking life, too – and if poor sleep is left untreated for long enough, it may even affect your dementia risk and longevity.Still, the causes behind fatigue may not be as simple as getting enough of the right kind of sleep. Some researchers think that getting in touch with our “body clock” is more important than the amount of hours’ kip we get, for instance.Speaking to HuffPost UK, Dr Babak Ash