Areyouhavingtroublefallingasleep?Areyourkidshyperactivewhenplayingwiththetabletbeforebedtime?Areyouusingyoursmartphoneortabletinthelateevening?Twilightmaybeasolutionforyou!Recentresearchsuggeststhatexposuretobluelightbeforesleepmaydistortyournatural(circadian)rhythmandcauseinabilitytofallasleep.Thecauseisthephotoreceptorinyoureyes,calledMelanopsin.Thisreceptorissensitivetoanarrowbandofbluelightinthe460-480nmrangewhichmaysuppressMelatoninproduction-ahormoneresponsibleforyourhealthysleep-wakecycles.Inexperimentalscientificstudiesithasbeenshownanaveragepersonreadingonatabletorsmartphoneforacoupleofhoursbeforebedtimemayfindtheirsleepdelayedbyaboutanhour.Seereferencesbelow..TheTwilightappmakesyourdevicescreenadapttothetimeoftheday.Itfiltersthefluxofbluelightemittedbyyourphoneortabletaftersunsetandprotectsyoureyeswithasoftandpleasantredfilter.Thefilterintensityissmoothlyadjustedtothesuncyclebasedonyourlocalsunsetandsunrisetimes.Documentationhttp://twilight.urbandroid.org/doc/GetmorefromTwilight1)Bedreading:Twilightismorepleasantontheeyesfornightreading.Especiallyasitisabletolowerthescreenbacklightfarbelowtheabilityofthebackligtcontrolsonyourscreen2)AMOLEDscreens:WehavetestedTwilightonanAMOLEDscreenfor5yearswithoutanysignofdepletionorover-burning.IfproperlyconfiguredTwilightcauseslesslightemission(byenablingdimming)withmoreequallightdistribution(darkareasofthescreensuchasthestatusbargettinted).ThismayinfactincreaseyourAMOLEDscreenlifetime.Basicsoncircadianrhythmandtheroleofmelatoninhttp://en.wikipedia.org/wiki/Melatoninhttp://en.wikipedia.org/wiki/Melanopsinhttp://en.wikipedia.org/wiki/Circadian_rhythmshttp://en.wikipedia.org/wiki/Circadian_rhythm_disorderPermissions-location-tofindoutyourcurrentsunset/surisetimes-runningapps-tostopTwilightinselectedapps-writesettings-tosetback-light-network-accesssmartlight(PhilipsHUE)toshieldyouhouseholdlightfromblueAutomation(Taskerorother)https://sites.google.com/site/twilight4android/automationRelatedscientificresearchAmplitudeReductionandPhaseShiftsofMelatonin,CortisolandOtherCircadianRhythmsafteraGradualAdvanceofSleepandLightExposureinHumansDerk-JanDijk,&Co2012ExposuretoRoomLightbeforeBedtimeSuppressesMelatoninOnsetandShortensMelatoninDurationinHumansJoshuaJ.Gooley,KyleChamberlain,KurtA.Smith&Co,2011EffectofLightonHumanCircadianPhysiologyJeanneF.Duffy,CharlesA.Czeisler2009EfficacyofasinglesequenceofintermittentbrightlightpulsesfordelayingcircadianphaseinhumansClaudeGronfier,KennethP.Wright,&Co2009IntrinsicperiodandlightintensitydeterminethephaserelationshipbetweenmelatoninandsleepinhumansKennethP.Wright,ClaudeGronfier&Co2009TheImpactofSleepTimingandBrightLightExposureonAttentionalImpairmentduringNightWorkNayantaraSanthi&Co2008Short-WavelengthLightSensitivityofCircadian,Pupillary,andVisualAwarenessinHumansLackinganOuterRetinaFarhanH.Zaidi&Co,2007Highsensitivityofthehumancircadianmelatoninrhythmtoresettingbyshortwavelengthlight.LockleySW&Co.2003Sensitivityofthehumancircadianpacemakertonocturnallight:JamieMZeitzer,Derk-JanDijk&Co2000