How can I learn more about aibo's Fall asleep function?

When I pick up my aibo™ robotic companion, all the joints in its legs relax. Is this a malfunction?
No, it is not a malfunction. The joints relax as the amount of strength exerted by aibo is adjusted according to the person holding it.

Why does aibo remain stiff while sleeping?
aibo is designed to keep its body rigid while sleeping.

Why does aibo become limp when I put it on my lap or put it on my lap and pet it?
Holding aibo up by just its front legs puts stress on the legs, so they become limp. Hold aibo on your lap so its torso is supported.

When I push the power button while aibo is sleeping, it wakes up and then goes back to sleep. Is this a malfunction?
No, it is not a malfunction. aibo is designed to wake up and then go back to sleep if you push the power button while it's sleeping.