Stacey Comerford, 15, from Telford in the West Midlands region, suffers from a rare neurological disorder which means she enters a sleeping state for months at a time, 'The Sun' reported.
She is just one of 1,000 people worldwide to be suffering from Kleine Levin Syndrome also known as Sleeping Beauty Syndrome.
The last -- her longest at two months -- meant she missed nine exams after being predicted straight As.
Stacey, who hopes to return to school part time, said she used to be taunted over the condition.
She said: "I've missed nine exams and my birthday. It's easier now people know what it is. It's easier to explain to them. Before, people didn't believe me. That was the hardest thing."
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