If virtue promises happiness, prosperity and peace, then progress in virtue is progress in each of these for to whatever point the perfection of anything brings us, progress is always an approach toward it.
A disruption of the circadian cycle—the metabolic and glandular rhythms that are central to our workaday life—seems to be involved in many, if not most, cases of depression; this is why brutal insomnia so often occurs and is most likely why each day’s pattern of distress exhibits fairly predictable alternating periods of intensity and relief.