orexin
A messenger made by a small group of brain cells that helps keep us awake through the day and holds sleep and waking steady. It's also called hypocretin.
Where it comes up
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01
Are sleeping pills safe to take?
Are sleeping pills safe? What prescription pills and PM sleep aids do, the risks of one hard night versus every night, and how people come off them.
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02
What is narcolepsy, and could I have it?
Sleepy all the time, or woke unable to move? What narcolepsy is, how it differs from ordinary tiredness, its signs and how it's diagnosed.