title: Android: When is WakeLock needed?
body: <p>If I have an IntentService that simply updates the <code>SharedPreference</code>, is a (partial) <code>WakeLock</code> needed?</p>
  
  <p>I understand that a <code>WakeLock</code> keeps the <strong>CPU</strong> awake, but when is it needed?</p>