Personal Light Tracker.

Sometimes it feels like the main takeaway from the last couple of decades of medical research is that we carry the burden of our genes with us throughout of lives and that, more than anything else, will bring us sickness or health – and only the miracles of new drugs or surgeries can shift our genetically determined fate.

Everyone’s done it. You’ve hit snooze, forgotten that all important class, and then panicked as you realise you’ve overslept. If this happens to you, you’re not alone. You can stop it happening though.

It’s easy to forget the effect of a circadian rhythm that is ‘out of whack’ unless it is explained periodically.