Sleep time allows you to schedule an OFF and ON time for Twitter updates going to your phone. For example, you can schedule your updates to shut off when you go to sleep, and turn back on automatically when you wake up - or, if you have regular meetings between 3 and 5 pm, you can turn your updates off between those times. (Keep in mind you can also turn updates on or off temporarily at any time via SMS.)
Sleep time settings are found under the mobile tab of your settings page, as shown below.
1. Log in to Twitter.
2. In the upper right hand navigation bar, click Settings.
3. Click the Mobile tab.
4. If you've added your phone, you'll see a drop down box to set sleep time; select your off and on time from the drop down box (pictured below).
5. Save your changes.
Note: make sure your time zone is correct or your sleep time might operate on someone else's schedule! Check your time zone in the account tab of your account settings.
Still need help? Contact Mobile Support.