Stanford Sleepiness Scale
Quantifies subjective degrees of sleepiness.
Feeling active and vital, alert, wide awake+1
Functioning at a high level but not at a peak, able to concentrate+2
Relaxed, awake, not at full alertness, responsive+3
A little foggy, not at a peak, let down+4
Foggy, beginning to lose interest in remaining awake, slowed down+5
Sleepy, prefer to be laying down, fighting sleep, woozy+6
Almost in reverie, sleep onset soon, lost struggle to remain awake+7
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