It's true that drinking coffee will disrupt the sleep. But British and American scientists found that drinking coffee will change the body clock(Body behavior) as well.
The British medical research council and American Colorado university researchers confirmed that Caffeine in the coffee will control and delays the Melatonin hormone which is triggering the sleep.
Drinking espresso coffee before the 3 hours of sleep will delay the melatonin hormone by 40 minutes.
Caffeine will be very helpful medicine for changing the body clock to whom having the sleeping problems and for flight travelers who has Jet lag.
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