Sony AIBO Explorer User Manual page 42

When you want to have AIBO sleep, but consider how AIBO feels
When you say "Good night" to AIBO, it makes a drowsy gesture for a while, and
then enters Sleep mode. However, if AIBO does not want to sleep, it may not sleep.
After AIBO has slept enough, it wakes up again on its own to start moving. To
wake up a sleeping AIBO, shake its body gently.
When AIBO sleeps on its own
AIBO will enter Sleep mode to sleep when it has nothing to
respond to or is tired of playing. After it has had enough rest,
it wakes up again on its own.
Note
If you connect AIBO to the AC adaptor via the conversion
plug while AIBO is in Sleep mode, AIBO enters Pause
mode.
To make AIBO start moving again, disconnect the AC
adaptor and conversion plug from AIBO, and then press the
pause button located on its chest.
42
Good night.
Chest light
(Slowly flashes green.)
Chest light
(Slowly flashes
green.)