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Updated: Jun 26, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Quantifying time awake posturographically.

P Forsman¹, A Wallin, A Tietäväinen

¹Finnish Institute of Occupational Health, FIN-00250 Helsinki, Finland. pia.forsman@ttl.fi

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 24, 2009

Summary

Posturography, a balance test, can now quantify sleepiness. This new method accurately estimates time awake and identifies excessive sleepiness, crucial for traffic and occupational safety.

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Area of Science:

Neuroscience
Human Factors Engineering
Biomedical Engineering

Background:

Sleepiness is a significant risk factor for accidents.
Current methods for quantifying sleepiness are inconvenient and not commercially available.
There is a need for objective sleepiness testing for policy and safety surveillance.

Purpose of the Study:

To investigate posturographic balance testing as a method for quantifying sleepiness.
To determine the relationship between time awake and balance performance.
To establish guidelines for a posturographic sleepiness tester.

Main Methods:

Balance was assessed using a force platform in 63 subjects during sustained waking (up to 36 hours).
Posturographic data was analyzed to correlate balance variations with time awake and time of day.

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A threshold for detecting excessive sleepiness was identified using balance scores at 13:30 hours.

Main Results:

Sustained waking significantly impaired balance.
Time awake explained 60% of diurnal balance variations, while time of day explained 40%.
Posturography accurately estimated time awake (86% accuracy, 97% precision) and identified excessive sleepiness at 13:30 hours.

Conclusions:

Posturographic testing offers a convenient and quantitative method for assessing sleepiness.
This technique can be used to estimate time awake and detect excessive sleepiness.
The findings provide a basis for developing a commercial posturographic sleepiness tester for safety applications.