Science Cows' 'Night Milk' May Help You Fall Asleep 7:27pm December 15, 2015 food Research News Science Share URL copied to clipboard! Play Pause There was an error loading the media player. Copyright 2015 NPR. To see more, visit NPR. 300x250 Ad More All Things Considered Science Days are getting slightly longer — and it's due to climate change by Lauren Sommer What happened to the glamorous days of airline travel? You pay for what you get by Erika Beras 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate