Pi2 doesn't Sleep?

[lah7]

I'm not sure if the Pi has a "sleep mode", but you could try the command:

sudo pm-suspend

If this works, then it's a matter of binding the command to Keyboard Shortcuts. As it's a sudo command, you would need to create an entry so you do not have to (or cannot) type the password.

How to run privileged (sudo) commands without the password

Sometimes, you may wish to run a command but you wouldn't want to pester the almighty super user (root / sudo) for the password. → ....... This tip will step through how to exempt the command from the password prompt from sudo like this prompt: [sudo] password for user: Precaution! Be cautious with which programs you wish to exempt from having to enter the password. Some commands could cause damage or put your system at risk if a…