Monitoring Driving in a Monotonous Environment: Classification and Recognition of Driving Fatigue Based on Long Short-Term Memory Network

Table 3

Stanford sleepiness scale.

Grade	Degree of drowsiness
1	Very excited, full of vigor and vitality
2	Physical function is at a high level, but not at the peak, and can concentrate
3	Very sober, but the body and mind are relatively relaxed, and reflect in time but not sensitive enough
4	A little tired and relaxed
5	Full of fatigue, no longer wants to stay awake, very lax
6	Began to doze off, dizzy, no longer struggle with sleepiness, just wants to lie down and rest
7	At the beginning of sleep, dreams begin to appear
X	Dead sleep