I don't have an answer for long-term melatonin unfortunately. In most folks circadian rhythm is not exactly 24 but slightly more or less. In this case it is he

I don't have an answer for long-term melatonin unfortunately. In most folks circadian rhythm is not exactly 24 but slightly more or less. In this case it is helpful to force the sync by getting exposure to sun light (or a source of similar quality) in the morning and religiously cut off exposure to light several hours before going to bed. Ideally you completely filter out both blue and green wavelength (which trigger the suppression of melatonin) and keep overall levels low. For more information see shift workers' strategies - they have to change their rhythm on a weekly basis.