Putting NAO to sleep:

Lay your hand on NAO ‘s head:palm on the top camera,fingers on the head tactile sensor,hold your hand there for 3 seconds to put NAO to sleep. Feedback:3 slight sounds while holding your hand: “blop”, “blop”, “click”,both eyes and status LEDs then become purple for a short moment.You may remove your hand.After 3 seconds, NAO goes to sleep.

Awaking NAO 

To wake NAO up:

• Touch the head tactile sensor.
• After touching it, NAO is awake.