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😴 Why does sleep deprivation feel like being drunk?

Thirty-nine people were tested across twenty-eight hours awake and against measured doses of alcohol. On some tests, seventeen hours without sleep matched the drink-driving limit - and the people who felt fine were the ones to worry about.

lessons

~11 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Somebody Ran the ExperimentState what the sleep-loss-versus-alcohol comparison was actually measured to show, and what it cannot be used to claim.In a 2000 study, thirty-nine people tested across twenty-eight hours awake and against measured alcohol doses performed, on some tests, as badly at 17-19 hours awake as at 0.05% blood alcohol. The overlap is in performance; the causes, the legal meaning and the exits are all different.
Attention Fails in PatchesExplain why sleep-deprived performance becomes variable rather than uniformly slower, and what a microsleep is.Sleep loss widens the spread of response times more than it moves the average, and can tip into microsleeps of half a second to fifteen seconds. Seventy percent of rested volunteers had them inside one dull fifty-minute task, and how badly any individual is affected is closer to a trait than a choice.
Two Clocks and a MoleculeConnect homeostatic sleep pressure, adenosine and circadian timing to the sudden arrival of fogginess at particular hours.The two-process model pairs rising sleep pressure with a daily circadian rhythm of alertness; adenosine is the best-established chemistry underneath the first. Caffeine blocks adenosine's receptors, which changes the feeling without clearing anything.
The Gap Between Feeling and FactRecognise why subjective sleepiness stops tracking objective impairment, and what that costs in safety-critical work.Across fourteen nights of restricted sleep, deficits kept accumulating while people's ratings of their own sleepiness levelled off. The same gap appears in crash data, and nothing but sleep closes it.

Questions this course answers

In Williamson and Feyer's study, what did seventeen to nineteen hours awake actually match?

The equivalence was in performance on some tests, not in blood chemistry. Nothing in the sleep-deprived participants would register on a breath test.

Why can a tired person seem normal one moment and miss something important the next?

The signature of sleep loss is widening variability rather than a smooth slowdown — which is why an average reaction time is such a poor guide to safety.

What does caffeine actually do to sleep pressure?

Caffeine is an antagonist at those receptors. The adenosine is still there, and the pressure is still waiting when the caffeine wears off.

Match each experience with the process behind it.

The drunk-like feeling is a bundle of separate changes arriving together, not one symptom with one mechanism.

In one sentence, why can sleep deprivation feel like being drunk?

The comparison is about overlapping output. It says nothing about shared chemistry, and it is not a licence to keep going.

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