Ok we have had a star sign thread so why not a biorhythms one!
I am not actually sure if this is made up and false or actually true, but it is interesting. It says that we have a physical cycle (23 days), an emotional one (28 days) and a intellectual one (33 days). Go to the following page and enter your date and year of birth, then it gives you graphs for these cycles (and a few others). Interesting.
http://www.procato.com/biorhythm/ (http://www.procato.com/biorhythm/)
I guess this is mostly bullc. Think about how easily you can ruin your day/night Rhythmus and your sleep patterns... I see now way how this stuff could still be accurate after so many years if it was in the first place (which is actually gerry well possible).
For my sleep pattern: it changes every day between 10pm and 4am going to bed, and sleeping until something between 4:30am and 9am