The International Rot Rating Hangover Classification System [©2015] explained:
Rot 1: A little spaced but otherwise all good. The only real sign you've been been drinking is the missing cash from your wallet.
Rot 2: A bit tired and a bit doddery. You can tell you've had a few the night before, but nothing a packet of crisps wouldn't sort out.
Rot 3: Thirsty and 'jumpy' with the hint of a headache. Work is manageable, providing human interaction is kept to a minimum.
Rot 4: As above, but communication has now become problematic. You feel very thirsty and your work rate has slowed down. You fancy a cooked breakfast.
Rot 5: A proper headache, with added paranoia. You can just about cope with work, although it's an effort. Must have water.
Rot 6: You demand ibuprofen and feel queasy and fatigued; a fried breakfast is no longer so appealing. Communication is a real chore. If you have to work then phoning in sick is under consideration.
Rot 7: Headache is debilitating, you feel nauseous but at the same time hungry. A horizontal position is desired. You may actually still be slightly drunk. Hair of the Dog could probably sort things out.
Rot 8: You are definitely still pissed but not in a good way. Your eyes hurt, your head is pounding and you may very soon be sick. You can only tolerate certain food stuffs, like crisps and toast. Noise offends. Hair of the Dog no longer an option.
Rot 9: As above except eating is right out. If you haven't already thrown up then you might think about inducing it. Movement of any kind makes you feel ten times worse.
Rot 10: You can't move, except to be sick. Your head feels like it might explode, the mere sight of food repels, and you have succumbed to a deep depression. You would sleep it off if you only could, but instead toss and turn relentlessly and vow never to drink again.