The orexin system and why we snooze after lunch.
I hadn't come across this hormonal system before (it was only discovered in rats around 1998) but it sounds very interesting.
More at http://en.wikipedia.org/wiki/Orexin.
Sugar subdues neurons in the brain that regulate wakefulness, and protein amps them up. Mixing both sugar and protein, however, leads to surprising results. Frontal Cortex blogger Jonah Lehrer explain…