【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.