Thinking About a Nexus 5 few of Questions

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http://forums.androidcentral.com – Just lost my M8 looking at Nexus 5 as replacement and wanted to ask a few of questions: 1) Is there a built in app to put the phone in "night mode" silence calls, emails, ect...? If not can anyone suggest a good app for this? 2) Is a Hot spot app built in or have to go third party for this too? Any suggestions if one not built in? 3) I hear so many different opinions on battery life is it really that bad? Thanks! (HowTos)