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(CNN)I won't take it personally if you yawn while reading this story.
Chances are ,you're sleep-deprived.
Sleep deprivation is such a rampant problem that last year, the Centers for Disease Control and Prevention called insufficient sleep a public health epidemic.
Teenagers may be suffering the most. Researchers at Columbia University's Mailman School of Public Health called the problem "The Great Sleep Recession" in a new study published in the journal Pediatrics.
They surveyed more than 270,000 teens in eighth, 10th and 12th grades between 1991 and 2012 and found that teens are getting less and less sleep.
The average amount is seven hours a day, which is two hours less than the nine hours they should be snoozing. African-American and Hispanic boys are the least likely to sleep enough. But why?
Katherine W. Keyes, lead researcher and assistant professor of epidemiology at Mailman, says researchers don't know. She and her team speculate that increased Internet and social media use is a factor as well as pressure and competition over the college admissions process.
Not everyone gets all their sleep at night though.
Babies and toddlers, for example, take naps to get it all in.
But a new study published in the journal Archives of Disease in Childhood says toddlers sleep better at night without the naps.
Australian researchers reviewed 26 previously published studies and found that napping beyond age 2 is linked to poor quality sleep at night. And, as many parents of toddlers will attest, it can also lead to an array of stalling tactics and protests at bedtime.
The authors of the study say there is no scientific evidence to continue having children older than 2 nap and recommend discontinuing it, especially if the child has trouble sleeping at night.