Wanaria

It could be interpreted as a state of mind but I'd like to think of it more as a state of combined laziness due to exhaustion.

Sinking into this state is usually caused by a combination of many stressful things coming at you at once. It could also be the pile-up of one thing (i.e. homework) that drives someone into this state.

Symptoms: ( not all apply to a given case) Laziness, procrastination, lack of activity and appetite, drowsiness, avoidance of the cause of stress or agitation at all costs

Certain individuals can even be labeled at wanaric- that is, they rarely find themselves out of this state of being.