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We spend a really (COMFORT) night tossing and turning until morning.
UNCOMFORTABLE
This situation could be (SYMPTOM) of a stressful week.
SYMPTOMATIC
Rather than enjoying (INTERRUPT) period of sleep at night, our ancestors had two naps.
UNINTERRUPTED
The eight-hour-a-night pattern has become almost (ESSENCE) to modern humans.
ESSENTIAL
It has only been (CUSTOM) in industrialised countries since the 19th century.
CUSTOMARY
After the 19th century (AFFORD) electricity was introduced which everybody could use.
AFFORDABLE
My eyesight became (PROGRESS) blurred.
PROGRESSIVELY
This fact (ABLE) us to sleep through the night.
ENABLED
