Sleep IQ Challenge: How Well Do You Know Sleep?

The questions

All 10 questions in this quiz. Correct answers stay hidden until you finish.

1. 1

   How much of your life do you spend sleeping?

   • About one-quarter (roughly 17 years)
   • About one-third (roughly 23 years)
2. 2

   How active is your brain during REM sleep?

   • Almost as active as when you are awake
   • It drops to its lowest level of the day
3. 3

   Which of these animals sleeps the least per day?

   • Sloth (about 10 hours)
   • Giraffe (about 30 minutes to 2 hours)
4. 4

   What is a "microsleep"?

   • Falling asleep for a few seconds without realizing it
   • A light sleep you can control with meditation
5. 5

   How long should an ideal "power nap" last?

   • 45 to 60 minutes
   • 10 to 20 minutes

Score bands

Your final score places you in one of these bands.

Sleep Newbie0–30

You have got a lot to learn about the thing you spend one-third of your life doing. Time to read up on sleep facts!

Casual Snoozer31–60

You know the basics of sleep science, but some surprising facts still slipped by. Solid start!

Sleep Scholar61–80

You know your way around sleep science pretty well! You got facts right that most people get wrong. Impressive.

Sleep Scientist81–100

You know sleep science at an expert level. Brain waves, REM cycles, microsleeps — you have mastered them all!

How this quiz works

Each question has one correct answer. When you finish, you get your score and can review every question with the correct answer and, where we have one, a short explanation.