Impact of Sleep Deprivation on Agricultural Injury Incidents. James M. Gregory Professor Civil Engineering Texas Tech University Retiring and moving to Shreveport, LA in May 2007. Education Objectives. Overview the general nature of sleep. Learn how age affects sleep need.
James M. Gregory
Professor Civil Engineering
Texas Tech University
Retiring and moving to Shreveport, LA in May 2007
Switch to deeper sleep
Delta: deep sleep (Stage 3 and Stage 4)
REM (Rapid Eye Movement) Sleep
Reference for waves
where R = increased risk of injury,
C = calibration coefficient (injuries/time),
effi = efficiency of performance during time period i,
i = a counter of time periods,
di = duration of time period,
N = total number of time periods at which efficiency is below normal, and
effni = efficiency of normal performance without alcohol or sleep debt.
If effi = effni, then R=0
Risk calculation depends on reference as well as current activity.
Increase fraction = Odds ratio – 1
SLEEP Model is not designed to compare risks for different activities.
If you drive a tractor for 8 hours instead of 4 hours, it does not increase the risk or odds ratio. It only computes the increase in risk or odds ratio associated with the reduced performance due to use of alcohol or loss in performance because of sleep debt.
Upper 95% confidence
Lower 95 % confidence
Average drinking rate
Binge drinking rate
Drinking distributed over 6 hr
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