Fri, Aug 17, 2012 - Page 10 News List

Why caffeine affects morning people more than night owls

A man holds up coffee beans above a basket for roasting at a coffee shop in Hanoi, Vietnam Aug. 7.

Photo: Reuters

Caffeine will get you going during the day but could leave you tossing and turning at night — unless you are a “night owl” to begin with, a new study suggests.

In the study, “morning people” who consumed caffeine during the day appeared more likely than late risers to awaken in the middle of their nighttime sleep.

Fifty college students were asked to record their caffeine consumption and their sleeping and waking times for a week.

As college students, they tended to be so sleep-deprived that, for most, “it didn’t matter how much caffeine they had” — they slept well whenever they finally hit the sack, said study researcher Jamie Zeitzer.

However, for the early risers, the more caffeine in their bodies, the more time they spent awake during the night after initially falling asleep. This was not seen in the night owls.

(Liberty Times)








1. toss and turn v. phr.

輾轉難眠 (zhan2 zhuan3 nan2 mian2)

例: I was tossing and turning all night.


2. consume v.

攝取 (she4 qu3)

例: Consuming too much of anything could be bad for your health.


3. hit the sack v. phr.

上床睡覺 (shang4 chuang2 shui4 jiao4)

例: I’ve got a busy day tomorrow, so I think I’ll hit the sack.


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