Ok - I like where this is going. Let's set up a couple continuums...
Inactivity = 0, complete physical exhaustion=10
This gives a physical activity rating of 0 to 10.
Mentally idle = 0, complete mental exhaustion - 10
This gives a mental activity rating of 0 to 10
Amount of sleep in hours - whatever
Focus, 0 to 10.
Seem like a plan?