It is surprising that humans and cell phones have the same states. Both of them have three states:
A cell phone is useless without plenty quantity of electricity, and humans also need to rest to be energetic. They both need to have a good rest before working. If they can not rest well, they can not perform well even they have great ability.
Most of time, cell phones and humans just keep holding state, ready to work and spend little energy.
When a cell phone runs some awesome apps, they must spend terrible electricity and become hotter, so do humans.
For the smart people, they can arrange and switch their states properly to be effective and healthy. Rest well, adjust working rhythm. They makes sense.