Sleep disorders require a medical diagnosis. The true per centage is difficult to determine, however, five to ten per cent of children snore regularly,75 two to four per cent have obstructive sleep apnoea,76 and others experience variations of upper airway obstruction such as upper airway resistance syndrome or other diagnosable sleep disorders like restless leg syndrome.77 Some have milder sleep disturbances from issues such as mouth breathing. Disordered sleep, in contrast, refers to situations where kids’ sleep is disrupted for other reasons, like a poor routine, a poor sleep environment or emotional disturbances.