So there is this.
This is a bit of a confusing schedule to follow I think, at least for the first little while. It would be handy to be able to put it into, say, a Google Calendar so one could work out where and when you would be.
Unfortunately in Google Calendar you can't say "This event should repeat every X hours" - it only copes with repeating in days, weeks, etc.
So the obvious solution is to do six seperate "sleep" events which each one repeating once a week. Great so far?
The problem with the six separate events is that you might want to have an adjustment in between - so you might occasionally want to get up an hour earlier or go to bed a couple of hour earlier - in such situations you'd like to adjust only next sleep time and have everything else adjust by the right amount automatically.