What good sleep looks like

The quality and depth of sleep can be measured scientifically. One such method is to make a record of the brain-waves and these can be calculated using the Sleep Frequency Index (SFx).

• An SFx of 100% is when you are wide awake
• SFx of around 95% is when you start to feel drowsy (eg. after a good lunch)
• SFx of 85 to 90% is when you are in the initial stages of sleep
• SFx 74% and below is when you are in DEEP SLEEP

We can use this Sleep Frequency Index to assess the quality of sleep a person is experiencing.

With good sleep, there is a regular rise and fall in SFx in cycles of around 90 minutes.

The low dips in frequency reflect the periods in which a person is in deep sleep. The higher peaks represent REM sleep – the period of sleep in which we experience dreams. As you can see below, good sleep will cycle between these stages without the individual waking.

When one is sleeping poorly, the rise and fall of SFx is not as regular.

As you can see in the image below, less time is spent below the 74% mark - in deep sleep. In this graph, the individual regularly wakes up during the night, instead of enjoying a cycle of deep sleep and REM sleep.

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