第1题
第2题
A.is regulated by the hypothalamus.
B.is affected by fading light.
C.is located in the brain.
D.tells the body it is time for sleep.
第3题
A.is driven by the potential of monetary gains to be made.
B.is a recent trend.
C.has been advanced with technological developments.
D.has relied on observations and assumptions about sleep being made.
第4题
A.linked to fatal diseases and conditions.
B.one of the main causes of strokes and heart failure.
C.common in babies.
D.unusual but can be life-threatening.
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