题目内容：
请阅读Passage2，完成第小题。
MillionsofAmericanslieawakeatnightcountingsheep,orhaveastiffdrinkorpopanallergypill,hopingitwillmakethemdrowsy.Butexpertsagreeallthatseff-medicatingisabadidea,andthecausesofchronicinsomniaremainmysterious.
Almostathirdofadultshavetroublesleeping,andabout10percenthavesymptomsofdaytimeimpairmentthatsignaltrueinsomnia.Sufferersreadilycitetheresultingproblems:walkingaroundinafog,asmemoryandcognitivefunctionsbecomingslow.Dozingoffatthewheeloratwork.Depression.Lackofenergy.Butforallthecomplaints,scientistsknowsurprisinglylittleaboutwhatcauseschronicinsomnia,itshealthconsequencesandhowbesttotreatit,apanelofspecialistsbroughttogetherbytheNationalInstitutesofHealthconcludedWednesday.
Twothingsareclear,thepanelfound:Chronicinsomniaisamajorpublichealthproblem.Andtoomanypeopleareusingunproventherapies,evenwhilethereareafewtreatmentsthatdowork.
Amongthepanel'sfindings:Cognitive/behavioraltherapy--apsychology-basedtreatmentthattrainspeopletoreduceanxietyandtakeothersleep-promotingsteps--isveryeffective,anddoesn'tcausesideeffects.Butitcanbehardtofindhealthproviderstrainedinthetechniques.Insomniacsshouldcheckwithboard-certifiedsleepspecialistsandpsychologists.
NewerprescriptionsleeppillscalledSonata,AmbienandLunestaworkwithoutmanyoftheside-effectconcernsofolderagentsknownasbenzodiazepines(苯二氧类镇静药).OnestudyofLunestashowedeffectivenesswithsixmonthsofuse,butmoreresearchonlong-termuseofallthreeisneeded,aschronicinsomniacanlingerforyears.
Themostcommonlyusedtreatmentsarealcoholandover-the-countersedatingantihistamines(抗组胺剂)likeBenadryl.Alcoholuseactuallydisruptsqualitysleep,andantihistaminescancauselingeringdaytimesedationandothercognitiveproblems.
Themostcommonprescriptioninsomniamedicineisanolder,sedatingantidepressantcalledtrazodone,eventhoughthere'snogoodevidencethatitoffersmorethanatwo-weekbenefit,anditcomeswithsideeffects.
Oneofthemosteffectivewaystodealwithchoricinsomniais_________. A．tohaveastiffdrink
B．topopanallergypill
C．tosleepandgetupearly
D．cognitive/behavioraltherapy
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