All grip a stalk with their mandibles and sleep with their bodies outstretched and their legs folded back.

Some, the stouter species, allow themselves to rest the tip of their arched abdomen against the pole.
This visit to the dormitory of certain Wasps and Bees does not explain the problem of the Empusa; it sets up another one, no less difficult.
It shows us how deficient we are in insight, when it comes to differentiating between fatigue and rest in the cogs of the animal machine.

The Ammophila, with the static paradox afforded by her mandibles; the Empusa, with her claws unwearied by ten months' hanging, leave the physiologist perplexed and make him wonder what really constitutes rest.

In absolute fact, there is no rest, apart from that which puts an end to life.

The struggle never ceases; some muscle is always toiling, some nerve straining.