that company's treatment that it's developing with the firm called incyte for rheumatoid arthritis was more effective than a commonly prescribed medication. shares rose slightly to $80.28. bank of america is expected to announce layoffs according to the wall street journal. a couple hundred people in an effort to cut costs. shares were off a fraction to $15.35. >>> the big business of sleep may get even bigger. a new study shows getting a solid night's rest can not only help your memory but can boost your immune system keeping you healthy. we take a look at the value of getting extra zs. >> reporter: scientists have known for a century that sleep facilitates our memories. research published today suggests it's similarly helping our immune systems remember, as well. researchers in germany and the netherlands compared the way our brains are understood to store memories with the way our immune system recognizes invaders. >> it all comes down to slow wave sleep, that time in our nonrem cycle that's the deepest slumber. it's during that time an important transfer occurs from our memories fr