Jan

8

 Trading hours upset the circadian rhythms of millions of people and we need to learn the side affects of sleep deprivation and how to deal with them.

Jim Sogi agrees:

When you don't sleep enough you get grumpy, uncoordinated, depressed, groggy. It's bad news.

Nigel Davies comments:

If trading does that to someone and he can't find a way around it — smaller position size, some kind of healthy stress relief — he should quit. It just isn't worth it.

Phil McDonnell explains:

A considerable amount of research has been performed into our nightly dream cycles. The typical cycle lasts about 90 minutes. So in six hours of sleep we get four completed cycles. In 7.5 hours we get fvie cycles, in nine hours we get get six. Note that eight hours does not give us an even number of cycles.

The importance of a full cycle was established a long time ago. When sleep researchers monitored test subjects and woke them at their deepest part of the dream cycle they were shown to be mentally impaired on simple cognitive tests. Awakened subjects could remember their dreams.

Subjects awakened after a full cycle performed much better on the same tests. The full cycle subjects could not remember their dreams.

Ideally sleep should be an even multiple of 90 minutes and one should awaken with no memory of the last dream. A corollary to this is that if one is awakened after, say, six hours and cannot remember a dream then it my be wise to get up. This is especially true if one feels refreshed and cannot stay in bed for another full hour and a half.

Dr. McDonnell is the author of Optimal Portfolio Modeling, Wiley, 2008


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