In which, the proportion of drivers with poor / relatively poor sleep quality was 53.5%, 31.5% of drivers had difficulty falling asleep; Average sleep time ≤ 5 hours was 65.5% with sleep efficiency ≤ 85% was 19.0%.
Trong đó tỷ lệ lái xe có chất lượng giấc ngủ kém / tương đối kém là 53,5%; 31,5% lái xe khó đi vào giấc ngủ; thời gian ngủ trung bình ≤ 5 giờ là 65,5% với hiệu quả giấc ngủ ≤ 85% là 19,0%.