We just learned about the Multiple Sleep Latency Test (MSLT).
Another thing about sleep is Narcolepsy a type of sleep disorder.
In TV and movies this disorder is shown as people just instantly falling asleep.
But in real life it is a little different. People with this disorder might collapse where their whole body stops working, but they are actually still awake, they just can't move.
(from: wikipedia - narcolepsy)
Kid Facts - Blast from the past: Stapes