Why caffeine affects morning people more than night owls 咖啡因對早起鳥的影響為何比夜貓子大

Fri, Aug 17, 2012 - Page 10

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)