A good night’s sleep should be the top ingredient for any healthy child. But it is not always that simple. All those questions that you have worried about are answered here: are there any foods that can help my child prepare for sleep? Is a bedtime ritual important? Imaginary friends, are they harmful? Putting some or all of her advice into practice could be the best thing you have ever done for your family. The Good Sleep Guide for Kids by Sammy Margo (£10.99 Vermilion)