How to simulate sleep mode on Android emulator

The Power Button on the sidebar next to emulator will do it.

The hotkey on my Mac is ⌘ P

Note: You will need to set Lock Screen using Swipe instead of None

On emulator, go Settings/Security/Screen lock change from 'None' to 'Swipe'

Then, click 'power' button on right control bar to turn off screen, and press again to turn on screen. Now the lock screen will show up.

Try the following on emulator

1. Go to Settings
2. Go to Developer options
3. Un-check Stay awake (3rd option from the top)

The emulator will go to sleep after 1 min (default setting) if not changed.

Press the power button to wake up the emulator.

Developer options is not enabled by default, to enable it, do the following:

1. Go to Settings
2. Click About emulated device
3. Click Build number 7 times, you should be notified that Developer options is now enabled
4. Go back and you should see Developer options