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America from "national geographic" and national institutes of health. say they eight hours is what you should be getting. many of us never do. matthew walker studies the impact of sleep on our health. professor walker. good to see you. hopefully you got a good night's rest last night. >> i did, indeed. >> okay. so how is it that not getting enough sleep is actually killing us? >> yes, so a lack of sleep as you mentioned is a sophisticate risk fact osh for a number of health problems. in fact, if you think of the two most feared diseases in america, cancer and alzheimer's disease, sleep loss is...

But what's happening is these stretchers are not returning back to the front lines for them to be reused. so, unfortunately, at troops direct, a common request from the front lines, bear in mind we're talking to commanders daily and filling their specific orders is for these stretchers. we get them from a company back east and they're the best of the best. >> this professor walker should get a big thank you note. it got people motivated. with the $20,000, you can support a unit of 1,000 men for their entire deployment which is eight to 10 months. when you do give them -- >> that's correct. >> ...

Since we were on last time, we've raised over $20,000 in support and it is helping to deliver to our service members the critically needed items that mr. walker obviously realizing are not available on front lines and it's medical supplies. it's nutritional supplies. it's hygiene supplies. it's supplies for our canines, it's equipment that they simply can't get over there. >> right. i understand, aaron, that one thing they don't need so much despite what we might think is blankets because for the most part, these guys, you know, they live out of their backpacks so they don't need blankets but ...

Night when the government officials runs out of dough. guys? >> thank you very much, we have been telling you about thomas walker, that iowa state university lecturer who slammed college republicans for raising money and supplies for our troops. >> now, walker said in a letter to the editor of the school's newspaper to refresh your memory "don't their families send them yuletide goodies, aren't g.i.'s paid enough to buy what they need? necessities should be doled out to people who really need them." >> well, our next guest says troops really need and deserve all the help they can get from all ...

Walker to embed with a combat unit for a week and see if he recants his statement after living on the front lines and experiencing what our young heroes experiencevery single day in securing our freedoms here at home. >> you took a negative situation and made a positive. people are taking action. >> we do it every day for our troops. >> you should give yourself a lot of credit for spending your time helping out other people. thanks so much. >> thank you very much. have a great day. >> all right. straight ahead before you hand out your gifts this christmas, you have to hear this. interesting ne...