chronotherapeutics

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Medical treatment administered according to a schedule that corresponds to a person's daily, monthly, seasonal, or yearly biological clock, in order to maximize the health benefits and minimize adverse effects.
• noun Treatment of a sleep disorder by altering an individual's sleeping and waking times and resetting his or her biological clock.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine Any of several forms of therapy that is administered in phase with a person's biological clock