Yep, I agree with Farmer. It can make people manic, or at the very least hypomanic. I've never heard of it making someone so manic they needed to be hospitalized, but it can throw her into the other extreme. If she has a pdoc (psychiatrist) they may have ideas on how long and how frequently she should sit in front of it. Hopefully she doesn't have that problem and can just be focused on not feeling depressed.