Quote Originally Posted by md
Really interesting subject Scrap. Circadian rhythms - the ones on a daily cycle - are the easiest to pick up on. Brain wave and hormone activity go up and down throughout the day effecting things like concentration and alertness. I think there are meant to be even shorter ones too. The longer ones are said to span over weeks, months and years.

I'm not sure if the longer rhythms actually exist. Far too difficult to measure accurately. Predicting someone's rhythms in say 2 months time on a given day with all the other variables involved would be hit or miss. We all know instinctively that things often go in cycles. But are these cycles regular?

Sounds like a good theory but I think there's an element of randomness to individuals biorhythms and so wouldn't stand up scientific scrutiny.

But if it works for you .......
I wonder how much these rhythms are acclimation to our habits and routines, with things like mood triggers that are already set up throughout your week and provide a framework for a rhythm. For instance say you work the same schedule every week, you may start to notice the day you get off your spirits are high. If you studied your life closely I think a lot of the rhythm may be carved out by simple events like this that occur every week over and over. Which days you sleep well and which days you eat well have a huge effect on how you feel mentally, physically and emotionally. Being someone with bipolar I can tell you for sure if I have a rhythm mine is much more like a Sun Ra record than a pop or classical song that tends to have very strong structure.