'He can get a three hour sleep compressed in twenty minutes'

The pioneering aircraft Solar Impulse is currently high over the Pacific - at a little over 7,200 feet - on its way from Nagoya in Japan to Hawaii. It's the most challenging leg so far of an extraordinary endeavour - it has to fly for 120 hours on solar power alone. Andre Borschberg is at the controls, solo. So how has this eight leg of the trip gone so far? Conor Lennon is with the Solar Impulse team.