I can think of nothing that will wake you up more quickly than Morning Glory. This is the first Grade 5 rapid you come to on a day’s rafting in the Batoka Gorge, below the Victoria Falls on the Zambezi river.

Think walls of white water, hanging on white-knuckled as the raft bucks and spins beneath you, all pretense at paddling gone and the guide screaming ‘High side!’

This is definitely not one for the faint-hearted. You’ll need to be prepared to fall off the raft at some stage; sometimes rafts flip entirely; and once you’re in the water there are occasional moments of washing machine drama as the churning water sucks you down and keeps you there.

For adrenaline kicks and rafting junkies, though, it’s amazing. There are long stretches of calm, floating gently on the green and lovely river, through the heart of Africa.

Then your guide will check your life jacket and say, “Right, the next rapid’s called Oblivion…”