The quest for sleep is something all parents obsess about - the combination of getting enough sleep themselves to encouraging their children to sleep. But how much sleep do we actually need, why is sleep so important and why, when you're exhausted is sleep sometimes hardest to achieve? From how long a nap should be to whether to wake a sleep-walking child, Marina quizzes neurologist and sleep specialist Professor Guy Leschziner about the science behind sleep, both of us, and our children. See acast.com/privacy for privacy and opt-out information.