Here's a description of chronotherapy from the website
ScienceDirect
Quote:
Chronotherapy
Chronotherapy is a behavioral technique in which bedtime is systematically delayed, which follows the natural tendency of human biology. Bedtime is delayed by 3-hour increments each day, establishing a 27-hour day. The procedure is maintained until the desired bedtime is reached (say 10 p.m.), when the normal 24-hour day is then established. This approach is favored by adolescents who are extreme night owls. It is difficult to administer, as a parent typically must be present to oversee unusual sleep and wake-up times, such as noon to 8:00 p.m.
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Yes its from a medical article about treating sleep problems in children but it's the simplest definition that I could find. I think it works the same on adults. Maybe give it a try and see if it helps you reconfigure your circadian rhythm of you body.