Youwill see a list of actions that
caused wakelocks.
If the app
causing wakelocks has a sync feature, set it to sync less often, sync manually, or disable sync entirely (if you never use it).
And you were really in trouble if an app encountered an error and
caused a wakelock — your phone could be nearly dead (and warm to the touch) in the morning.
Not exact matches
For example, in the screenshot below, we can see several
causes of
wakelocks: Google Maps automatically updating our location (presumably so Google Now will know where we are), Pocket syncing our unread articles, Twitter syncing new tweets, and the Google + app syncing new content.