Craig Barritt/Getty ImagesRobin Roberts is going to need to have her mornings to herself for a little while.
The Good Morning America cohost will be taking a leave of absence late next month while she undergoes a bone marrow transplant to treat myelodysplastic syndrome, a disease of the blood and bone marrow that she was diagnosed with earlier this year.
"It's fascinating-slash-scary how to prepare yourself for something like this," Roberts, a breast cancer survivor, told reporters via satellite during an ABC panel at the Television Critics Association press tour.
The 51-year-old TV veteran admitted to having "moments of fatigue," but she also said she's excited about GMA's recent gains on the Today show in the every-competitive morning ratings race.
"The run that we've had has truly energized me," Roberts said. "It's pretty good medicine, I gotta say, to be taking!"
As for who will be called upon to help GMA sustain its momentum, Roberts said that "wonderful friends" like Barbara Walters, Diane Sawyer, Katie Couric and, perhaps, Kelly Ripa will serve as a guest host alongside George Stephanopoulos in her absence.
Roberts, who has been coanchoring Good Morning America since 2005, said last month that her condition, MDS (formerly known as preleukemia), was a complication of the chemotherapy and radiation treatments she underwent for breast cancer.