A mother from Liverpool wants to know if giving her son the swine flu jab caused him to contract a sleeping disorder.
Lucas Calreton from Liverpool can sleep for up to 20 hours a day as he suffers from the condition narcolepsy.
Experts said the vaccine Pandemrix increased the child's risk of the disorder, which causes excessive daytime sleepiness.
The research suggests that for every 55,000 doses delivered, around one child developed the condition.
More than 850,000 English children aged six months to 16 years were given the vaccine at the height of the pandemic.