To help preserve battery power, the Nexus One has a screen timeout setting that will turn the screen off after a certain amount of time that there is no activity. You can change the delay time and extend or reduce the amount of time before your device’s screen turns off.
1. Go to the Nexus One’s Main screen.
2. Select the Menu key.
3. Select Settings.
4. Select Sound & display.
5. Scroll to the bottom and select Screen timeout.
6. Select the desired delay time. Choices are 15 seconds, 30 seconds, 1 minute, 2 minutes, 10 minutes, or 30 minutes.