Have you ever woken up to realise that you no longer remember your name? The significant other next to you in the bed is a little less significant, and little more than a stranger?

Walked through to the bathroom, looked at yourself in the mirror and had no idea who the weathered individual peering back at you is? You have ordered coffee but have no recollection of its taste, or whether or not you even like it. Told you have to make your way to work, and have had no idea where you work, what you do, or in fact what this thing work is that people keep insisting you go to?