Q 01/05

Slipping into REM within minutes of dozing off is a hallmark of which disorder?

A) Insomnia

B) Sleep apnoea

C) Restless legs syndrome

D) Narcolepsy

Answer · why

D) Narcolepsy

Narcolepsy: most sleepers take an hour or more to reach REM, but people with narcolepsy often enter it within 15 minutes, which is why dream imagery a...

Q 02/05

Which colour of light, plentiful in phone and laptop screens, does most to delay the body's night-time sleep signal?

A) Red

B) Green

C) Amber

D) Blue

Answer · why

D) Blue

Blue: in a Harvard experiment it shifted the body clock about twice as far as green light, while dim red light disturbs the clock least, so red suits ...

Q 03/05

Which inventor is said to have napped with a ball in each hand, so that the clatter cut each nap short?

A) Nikola Tesla

B) Alexander Graham Bell

C) Thomas Edison

D) Henry Ford

Answer · why

C) Thomas Edison

Thomas Edison is said to have prized the ideas that surface at the edge of sleep, and a 2021 study backs him: as little as 15 seconds of that drowsy s...

Q 04/05

Roughly how long does one full cycle of adult sleep last?

A) 20 minutes

B) 45 minutes

C) 90 minutes

D) 3 hours

Answer · why

C) 90 minutes

About 90 minutes: sleep pioneer Nathaniel Kleitman argued the same rhythm keeps ticking through the day, nudging alertness up and down roughly every h...

Q 05/05

Which pair of EEG features is characteristic of NREM Stage 2?

A) Spindles and K-complexes

B) Alpha and beta waves

C) Delta and theta waves

D) Gamma and mu rhythms

Answer · why

A) Spindles and K-complexes

Spindles and K-complexes: a K-complex is the single largest event in a healthy human EEG, and a sound or a touch can trigger one without waking the sl...