RHYTHM OF LIFE

Body Clock: What Makes Us Tick?, 9pm, BBC2

TICK-TOCKING away 24/7 in each and every one of us, our biological clocks govern our

daily rhythms, affecting our health as much as our diet and exercise routine. In this Horizon film, evolutionary biologist Ella Al-Shamahi sets out to discover how body clocks work, what they do, and what cann be done to manage them. them And so she shuts former Commando Aldo Kane (pictured with Al-Shamahi) inside an abandoned nuclear bunker with no way of telling the time, for ten days straight.