Jo looks at one of the most stressful parenting issues: getting your children to sleep.
In Woolwich, Jo visits six-year-old Paige, who has never slept a full night in her own bed: meaning that her mum hasn't had more than four hours uninterrupted sleep in over six years.
Also, with the number of obese six-year-olds doubling over the last ten years, and one third of children being obese by the age of 11, Jo works with Dr Laura McGowan, chartered psychologist and Research Associate at University College London, to discover the impact of calories and portion sizes on children's health.
Jo hosts a lunch party for 40 eight-year-olds, with 20 children given a meal providing the right number of calories for their age, and the other table of 20 given double the amount. Will the kids know when to stop or will they consume more than is healthy just because it's in front of them?
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