America is obsessed with diets, but sometimes gaining weight is more complex than calories in versus calories burned.
According to a study, that blurry feeling you have when you first wake up is kind of like being drunk.
Can you imagine lasting an entire month without sleep? Believe it or not, newborn dolphins and killer whales have been observed to do just that. Learn more on this Moment of Science.
The researchers caution, though, that this doesn’t mean you should force yourself to get seven hours exactly. It’s more likely that each person needs a certain amount of sleep–whatever your number may be–and will do best by getting neither more nor less.