I discuss melatonin's effects on sleep & its safety; I segue into the general benefits of sleep and the severely disrupted sleep of the modern Western world, the cost of melatonin use and the benefit (eg. enforcing regular bedtimes), followed by a basic cost-benefit analysis of melatonin concluding that the net profit is large enough to be worth giving it a try barring unusual conditions or very pessimistic safety estimates.
Full essay: http://www.gwern.net/Melatonin
Melatonin is best for sleep quality improvement with people who are above 40 as endogenous melatonin production usually starts to decrease from 30. You're much younger than that, so sleep disturbances are less likely to be caused by low night melatonin levels (so supplementary melatonin is less likely to be a significant remedy).
For at least some of us, the decrease in sleep is a boon. I'm only 36, and over the past 4-5 years I've had a very noticeable decrease in sleep, without any apparent side effects. It's not uncommon for me to sleep six hours and wake up refreshed before the alarm clock goes off, which is wonderful for someone who used to have to budget at least 8 hours a day for sleep.