The system designs are based on extensive research into the needs of children during sleep. The research, which is based on over 20 case studies throughout the UK and Ireland, some lasting up to two years, clearly demonstrated that the two main issues relating to children using sleep systems, beyond health and safety, are posture and tolerance. The research also focused on the needs of the family and the children’s carers, so the systems were designed to be comfortable, supportive, flexible, easy to use and easily transported. Sleep is important to health and well-being, and as part of a 24-hour postural care program, it is crucial to ensure that children have the best chance for a good night’s sleep. The main contributing factors to asymmetry during sleep are abnormal tone and gravity. Sleep systems provide an ideal opportunity to harness the potentially positive effect of gravity by supporting the child in a symmetric posture when their tone reduces during sleep.