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We often wonder why we are awake at night and worry over our sleep habits and patterns. To answer these questions, first we should come to understand the normal, natural state of the rhythms of sleep.

A person can get by on 6 or even 4.5 hours of sleep per day without question. The secret is NOT the amount of sleep, but rather the number itself; a multiple of 90 minutes will change your life.

1.5 hours / 3 hours / 4.5 hours / 6 hours / 7.5 hours

Kingdom Fuel - Drs. Mark & Michele Sherwood

Those are the sleep quantities that you should aim to get, and those are what your body will naturally take, removing the alarm clock. Not always 100% of the time.

Go to sleep without an alarm clock, and watch what times you naturally wake up at. It will be a multiple of 90 minutes from when you first went to bed. This 90 minutes is known as a sleep cycle, and it’s how I live my life.

If there are drugs such as Ambien, Lunesta, Benadryl etc. on board these interrupt the body’s natural rhythms. In medical school we are forced to learn how to sleep on the run.

Typically, I sleep 3 hours a night, and nap for 90 minutes in the evening. That’s a total of 4.5 hours, and I am always alert, always awake and always feel rested and refreshed.

Oh, and on 3 hours of sleep a night, I have one cup of coffee at the most per day. The sleep cycle is a beautiful thing!

“Studies show that the length of sleep is not what causes us to be refreshed upon waking. The key factor is the number of complete sleep cycles we enjoy.

Each sleep cycle contains five distinct phases, which exhibit different brain- wave patterns. For our purposes, it suffices to say that one sleep cycle lasts an average of 90 minutes: 65 minutes of normal, or non-REM (rapid eye movement), sleep; 20 minutes of REM sleep (in which we dream); and a final 5 minutes of non-REM sleep. The REM sleep phases are shorter during earlier cycles (less than 20 minutes) and longer during later ones (more than 20 minutes).

If we were to sleep completely naturally, with no alarm clocks or other sleep disturbances, we would wake up, on the average, after a multiple of 90 minutes–for example, after 4 1/2 hours, 6 hours, 7 1/2 hours, or 9 hours, but not after 7 or 8 hours, which are not multiples of 90 minutes.

In the period between cycles we are not actually sleeping: it is a sort of twilight zone from which, if we are not disturbed (by light, cold, a full bladder, noise), we move into another 90-minute cycle. A person who sleeps only four cycles (6 hours) will feel more rested than someone who has slept for 8 to 10 hours but who has not been allowed to complete any one cycle because of being awakened before it was completed…”

-From the Center for Applied Cognitive Studies

This explains why, when I get 8 hours of sleep I feel tired and groggy, or when I get 4 hour of sleep, I can barely wake up.

As human beings, we should know about this fact, as everyone always says “get your 8 hours”. Yet some people fare better than others. Why is that? Probably because the more rested people are actually getting closer to 7.5, or 9 hours, while the 8 hour folk feel constantly unrested.

It is said that many of the most productive people in history have understood and practiced this. Leonardo Da Vinci, Thomas Jefferson, and Buckminster Fuller used this *exact* technique. Other great minds likewise used naps to their advantage including Nikola Tesla, Thomas Edison, Napoleon, and Winston Churchhill.

Naps are the key to direct Theta brainwave access. Theta brainwaves are the brainwaves of hyper awareness. The more theta you have during your waking hours, the more creatively intelligent you are–it’s really that simple.

As far as longevity, Fuller lived to 87. DaVinci into his late 60’s. –Both lived over DOUBLE the average life expectancy of the men of their time.

Should I take naps?

Monophasic sleep is the “norm” for North American culture. We sleep at night, and work during the day.

Polyphasic sleep consists of multiple sleep/ wake incidents scattered throughout the day. A sleep schedule with an afternoon nap is an example of polyphasic sleep (not quite reasonable in todays fast world pace).

There is evidence to suggest that humans were originally suited to a polyphasic sleeping routine, rather than the arbitrary monophasic one that we are used to. For starters, almost all animals in nature conform to polyphasic behavior. In addition, polyphasic behavior is the predominant mode of sleeping for human infants, and even in the later years, children have to slowly be weaned from the afternoon nap.

Furthermore, when people are isolated from the external environment – so that they cannot determine the actual time of the day from natural cues such as sunlight, or artificial cues such as clocks or television programs – they tend to exhibit more napping behavior instead of retaining the single monophasic sleep period during the “night.”

Finally, it appears that naps – relatively brief sessions of sleep – are more effective in refreshing the mind, than longer periods of sleep. In a sense, we were taught to “unlearn” this natural way of sleeping, when we had to adjust to the arbitrary 9-to-5 schedule.

“A group of Harvard scientists trained volunteers to perform a visual task that required them to learn how to recognize certain patterns as they flashed quickly on the computer screen. When the subjects were tested 10 hours later, those who had taken a 90-minute nap did much better than those who didn’t nap. In fact, they did as well as people who got a full night’s sleep in a previous study.”

Interesting Note: Your brain cells reset their sodium & potassium ratios when the brain is in Theta state. The sodium & potassium levels are involved in osmosis which is the chemical process that transports chemicals into and out of your brain cells.

After an extended period in the Beta state the ratio between potassium and sodium is out of balance. This the main cause of what is known as “mental fatigue”. A brief period in Theta (about 5 – 15min) can restore the ratio to normal resulting in mental refreshment.

With regular sleep patterns: unwaveringly bi-phasic. I’m healthy, I don’t eat any sugar whatsoever, my cholesterol is low and my productivity is higher than it has ever been.

How to Transition to a Better Sleeping Pattern

  1. Measure the length of your sleep cycle. 90 minutes is a good average, but for some people it is different. Mine has actually changed in the last few years from 90 to about 75. Now, if I hit the pillow at 7:00, I wake up for the first time at 8:15. Never, ever using an alarm clock. Because of the change in sleep cycle length, I now get 4 cycles per day. Usually three late at night, and one in the evening.
  2. The key thing is, it MUST be divided up into two distinct sleep sessions per day. It’s not enough to just get 4.5 hours and say “that’s my sleep done for today”. You’ll have a hard time staying awake for the remaining 19+ hours. You’ve got to divide it into two (or more) sleep sessions if possible. The REM sleep you achieve has to be spaced throughout the day for it to have the proper “flushing” effect. A noon nap or evening brief 90 seconds before your late and last set of cycles for the day.