I can pretty much adjust my cycle at will. Example: sunday morning i was to cover half the overnight shift from 3am to 7am. I took melatonin around 7pm and slept from 8pm to 2am. I was up from 2am sunday until 9pm sunday, went to bed at 9 and woke up at 4 this morning= right back on schedule.
melatonin is all natural and works wonders if you need to sleep at an irregular time. When i work full overnights 11p-7a, i take melatonin at 3pm and sleep until 10 pm, then i work the overnight and stay up the whole day. without melatonin i cannot sleep during daylight hours.
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I don't know what the future holds, but I know Who holds the future.