(2016·四川高考·D)
A warm drink of milk before bed has long been the best choice for those wanting a good night's sleep.But now a study has found it really does help people nod off—if it is milked from a cow at night.
Researchers have discovered that “night milk” contains more melatonin (褪黑激素)，which has been proven to help people feel sleepy and reduce anxiety.
