The hypocretin system is known to play a key role in controlling sleep and wakefulness.
BBC: NEWS | Health | Immune system link to narcolepsy
He said narcolepsy was linked to a loss of a particular type of brain cell called a hypocretin neuron.
It could pave the way for a new test to identify people at risk, so action could be taken to prevent the loss of hypocretin neurons before they fell to a level low enough to trigger narcolepsy symptoms.
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