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My best friend did the same and we have until this day, you would think we were 16 years old, stay up all night long, sometimes until 3:00 or 4:00 in the morning texting each other. only time we have time to communicate, it's like a sickness. >> night time texting not so smart. >> correct. >> everything in moderation may be good. we may be using phones to make us smarter but when we overuse something, even our phones, this can be a problem, when you're using it at night, the lights from the screen can affect the way we sleep. >> i absolutely dim it to the lowest setting. >> it still makes a di...

>> the odds of you standing there with the big check are just north of zero. so, why do we buy a ticket? >> are you ready. >> scott hotel is part of duke university's neuroeconomics team, exploring among other things why smart people make foolish decisions with their money. >> people don't buy a lottery ticket just because they have a chance of winning. they will buy a ticket because over the next couple days it allows them to fantasize what they would do if they won the lottery. in a sense they're paying for that experience rather than a chance for the lottery itself. >> it's not ju...

Money, risk our money. everything because it shows what's happening right up here. in the mri, volunteers are presented with different choices. keep a small amount or risk it to win more. by changing the dollar amounts at risk and the dollar amounts that can be gained, scientists are able to see how different areas of the brain react as decisions are made. >> there's an area we're very interested in called dorsal medial prefrontal cortex, the area in the middle, top and front of your brain, and that part of the brain seems to act as almost like a switch in a train yard or it's telling all the ...

♪ can't get enough love ♪ addicted to love truer words were never spoken. time for your "a.m. house call" this morning. they say breaking up is hard to do. how does your brain react to hearing this? things just aren't working out. let's just be friends. it is not you. it is me. not that i have ever spoken those words before. a new study looks at what is going on in our brains, breakups that can turn violent, deadly. ellen fisher led the study. she joins us. good morning to you. >> good morning. i am so fascinated by this. >> so am i. >> when you see the amount of stalking and suicide and...