These may include not eating before bed, not looking at your smart devices before bedtime, or exercising in the evening. Throughout the day, your internal clock rotates between sleep and wakefulness.

Celebrating reading and the 100 novels that have shaped our world. John Yorke unpacks the themes behind the stories in Radio 4's weekend afternoon dramas.

Tom Hardy reads a bedtime story about a plastic bag, who finds herself all at sea. This video can not be played To play this video you need to enable JavaScript in your browser.