Editing Smartphone (section)

===Sleep===
{{Main|Electronic media and sleep}}
Using smartphones late at night can disturb sleep, due to the blue light and brightly lit screen, which affects [[melatonin]] levels and [[sleep cycles]]. In an effort to alleviate these issues, "Night Mode" functionality to change the [[color temperature]] of a screen to a warmer hue based on the time of day to reduce the amount of blue light generated became available through several apps for Android and the [[f.lux]] software for [[Jailbreak (iPhone OS)|jailbroken]] iPhones.<ref>{{cite web|url=http://www.howtogeek.com/199303/reduce-eye-strain-and-get-better-sleep-by-using-f.lux-on-your-computer/|title=Reduce Eye Strain and Get Better Sleep by Using f.lux on Your Computer|last1=Hoffman|first1=Chris|date=October 23, 2014|website=How-To Geek|access-date=January 15, 2016}}</ref> [[iOS 9|iOS 9.3]] integrated a similar, system-level feature known as "[[Night Shift (software)|Night Shift]]." Several Android device manufacturers bypassed Google's initial reluctance to make Night Mode a standard feature in Android and included software for it on their hardware under varying names, before [[Android Oreo]] added it to the OS for compatible devices.<ref>{{cite web |last=Blichert |first=Frederick |title=How to enable Night Mode on Android to reduce eye strain |url=https://www.androidauthority.com/night-mode-on-android-886864/ |date=July 17, 2019 |access-date=November 8, 2019}}</ref>

It has also been theorized that for some users, addiction to use of their phones, especially before they go to bed, can result in "[[ego depletion]]." Many people also use their phones as alarm clocks, which can also lead to loss of sleep.<ref name="cnet-bluelight">{{cite web|title=Stop your gadgets from keeping you awake at night|url=http://www.cnet.com/how-to/stop-your-gadgets-from-keeping-you-awake-at-night/|website=CNET|access-date=1 June 2016}}</ref><ref>Kalsbeek, Andries (2012). ''[https://books.google.com/books?id=53Jxsj5ZZ98C The Neurobiology of Circadian Timing]'' Elsevier. pp. 382.</ref><ref>{{cite web|first=Luisa |last=Dillner |url=https://www.theguardian.com/lifeandstyle/2013/jun/09/smartphones-tablets-in-bedroom-sleep |title=Should I keep my smartphone and tablet out of my bedroom? |work=The Guardian |date=June 9, 2013 |access-date=June 17, 2014}}</ref><ref>{{cite web|url=https://www.sciencedaily.com/releases/2013/06/130603163610.htm |title=Are smartphones disrupting your sleep? |website=ScienceDaily |access-date=June 17, 2014}}</ref><ref>{{cite news|first=Mahesh |last=Sharma |url=http://www.smh.com.au/digital-life/digital-life-news/switching-off-your-smartphone-at-night-makes-you-more-productive-20140403-zqpc4.html |title=Switching off your smartphone at night makes you more productive |newspaper=[[Sydney Morning Herald]] |access-date=June 17, 2014}}</ref>