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Watch Horizon Season 40 Episode 2 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Horizon: Narcolepsy is a disorder that for a long time has baffled scientists, with sufferers living in a twilight world between sleeping and waking, and where symptoms include nightmarish hallucinations and paralysing fits that can strike at any time. This programme examines ground-breaking research into the condition, which has raised the possibility of drugs that could remove the need for sleep for days : a release for narcoleptics and a chance for a true 24-hour society to emerge.