Start school later, sleep longer, learn better: New study shows that flexible school start times can be an effective and practical approach to reducing chronic sleep deprivation and improving adolescents’ mental health and academic performance.

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"A lot of people are speculating we're going to get a tremendous amount of money - it doesn't work like that," Paul said.

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Therefore, Ahmed, who is based in London, said it was difficult without more research to know exactly what is behind the rise in cases.