【UsingtabletcomputerslikeApple'siPadandSamsung'sGalaxyNotejustbeforebedcanleadtoapoornight'ssleep，accordingtoresearch.MoreandmorepeoplearetakingtheirtabletcomputerstobedwiththemtosurftheInternet，checkF】

　　UsingtabletcomputerslikeApple'siPadandSamsung'sGalaxyNotejustbeforebedcanleadtoapoornight'ssleep，accordingtoresearch.

　　MoreandmorepeoplearetakingtheirtabletcomputerstobedwiththemtosurftheInternet，checkFacebookoremailbeforeswitchingoffthelight.__1__

　　Thatisbecausethistypeoflightislikedaylight，convincingthebrainthatitisstilldaytime.

　　Bluelightsuppresses(抑制)theproductionofabrainchemicalcalledmelatonin，whichhelpsusfallasleep.__2__

　　Bycontrast，thelightwhichisorangeorredintonesdoesnotsuppressthemelatoninproduction，perhapsbecauseourbrainsrecognizeitasasignalthatthedayisending.

　　__3__Whethertheyaretelevisionscreens，computerscreensormobilephonescreens.

　　However，becausemobilephonesandtabletcomputersarebynatureportable，nottosayaddictive，morepeoplearetakingthemintothebedroom.__4__

　　ResearchersattheLightingResearchCentre，attheRensselaerPolytechnicInstituteinNewYork，arewarningthatlookingattabletcomputers'displaysformorethantwohours“leadstothesuppressionofournaturalmelatoninlevelsasthedevicesgiveoffopticalradiationatshortwavelengths”．__5__

　　A．Inotherwords，theygiveoffbluerlight.

　　B．Butresearchersarewarningthatthebluishlighttheirscreensgiveoffcanstopusersgettingagoodnight'ssleep.

　　C．Usersalsotendtoholdthemmuchclosertotheireyesthanacomputerortelevisionscreen.

　　D．Itisnotjustagoodnight'ssleepthatcouldbedamagedbytoomuchlatenightscreentime.

　　E．Neurologistshaveknownforyearsthatstaringatscreenslateintheeveningcandisruptsleep.

　　F．Thisisbecauseourbrainshaveevolvedtobewakefulduringdaylighthours.

　　G．Researchersknowthatpersistentdamagetosleeppatternscanleadtoanincreasedriskofobesity，andevenbreastcancer.