Apple Macintosh PowerBook 145 - Manual (Page 34)

Sleep
When the PowerBook is in sleep, it draws enough power to
maintain the information in its memory (including any open
programs and documents). The computer is on, but almost
completely inactive.
You should put the computer to sleep to conserve power when
you take a work break.
To put the PowerBook to sleep
m If the computer is on, choose the Sleep command from the
Special menu.
m If the computer is off, you need to turn it on before you can
put it to sleep.
Automatic sleep
If you don’t use the computer for several minutes, it goes to sleep
automatically. This conserves battery power. You will notice that if
you spend several minutes reading without using the computer,
or if you take a break, the screen may be dark when you’re ready
to resume working.
To wake the computer, press any key on the keyboard (except
Caps Lock). The desktop reappears looking just the way it did
before the computer went to sleep.
18 Chapter 1: Setting Up Your Macintosh PowerBook