(CBS News) Claire Zion credits hypnosis for giving her energy during her breast cancer treatment.
"I rode my bike to radiation every day," she says.
Radiation treatments tend to wipe out patients. After a double mastectomy in 2010, Zion took part in a study at Mount Sinai Hospital where 200 patients had cognitive behavioral therapy and hypnosis during treatment.
The result: Patients had more energy and reported less anxiety.
"Feeling anxious and worried can lead to fatigue and that's one of the steps we're working with patients to be more in control of those kinds of emotions," says Dr Guy Montgomery.
Researchers found six months later, patients who had hypnosis and therapy still felt less fatigued.
"They learned the skills that they needed to help themselves feel better over time and hopefully improve their quality of life," says Dr. Montgomery.
Zion is cancer-free but she's starting hypnosis again.
"It teaches you to find a place where you can quiet that noise and comfort yourself," she says.
She's hoping the therapy will help her sleep better.