I have a very nocturnal schedule - if I am diurnal too long, I feel like I'm going to have a nervous breakdown (too much noise, too many people, etc).
I've found it necessary, of course, to adjust my rhythms at times for various purposes. In my experience, pulling an all-nighter does not really work well at all. If I lengthen my day I find it throws me right off a 24 hour cycle altogether, and I overshoot the correction. I usually plan to do this over the course of 2 full days.
The best thing to do, I find, is to just go to bed at my usual time, and make myself get up in about 4-5 hours, or whatever the minimum amount of time is necessary for me to be able to get through that day without taking a nap, which could be disastrous. You may have to experiment some to determine how much sleep is the minimum for you.
I plan for a day where I can avoid any mental strain (for me, this means a day where I don't have to be around anyone or out in public). But, I place some physical strain on myself - cleaning out closets or tackling some other project. At the end of they day, I want to feel exhausted from both exertion and a lack of sleep. It should be a hard, nasty day - the kind where I can't wait for it to end.
I want to actually be going to bed earlier on that day than my target bedtime. So, if I want to be sleeping 11pm to 6 or 7 am, I want it so that I will be straining to stay awake by 8pm on the first day, so that it will take a real feat of willpower to stay up to 9pm. This is because there is a good chance I will sleep more than 8 hours that night.
The next day, I usually feel better than the previous one but I'll still be drained and tired and out-of-sorts. If everything's gone as described so far, I take it easy on this day. I relax, but I make sure I don't do the sorts of things that I get wrapped up in, things that cause me to lose sense of time. I take a shower just before I go to bed. I make sure I've had proper meals that day.
This usually works for me very well (although, over a period of about 2 weeks, my rhythym gravitates back to a nocturnal state because I can no longer tolerate being deprived of the peaceful quiet space I get at night). The only problem is, that it takes a couple of days during which I'm functioning at a very reduced level.