https://www.selleckchem.com/
Assess the change in sleep and vigilance of underground miners during long periods of extended shifts. Seventy miners worked 14 consecutive 12-hour day and/or night shifts. Also, they wore an actigraph and completed a visual analog scale for vigilance four times per shift. Linear regression models with mixed effects were used. Sleep efficiency was higher during day shifts than during night shifts (86,5 vs 85.5, P 0.05) but sleep duration did not differ (634 vs 644, n.s.). Mean vigilance level at Time 3 (02h0 was significantly lower than that at Time