Unverified85% confidenceDecision RuleTime unknown
定时关闭功能应支持'渐弱淡出'（fade-out）而非硬性断电，突然静音会因'静默反差'把已入睡者唤醒；选购时确认是否有淡出功能且时长可调（理想15-30分钟渐弱）
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85%
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Long-term
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Unverified定时关机功能应确认支持渐弱（fade out）关闭而非骤停，突然断声反而可能惊醒浅睡者；同时优选可设定多档时长（如30/60/90分钟）的机型94% similarUnverified定时功能必须支持'渐弱关闭'(fade out)而非硬切断，硬切断在入睡临界点会因声音突然消失把人惊醒，优先选带30-60分钟渐弱定时的机型93% similarUnverified定时关机应支持渐暗渐弱(fade-out)而非硬性断电，硬断电会在入睡临界点因突然安静/黑暗而惊醒，选购时确认是否有15-60分钟渐弱功能92% similarUnverified定时关机功能必须选带'渐弱淡出'（fade-out）的机型：硬性到点静音会因声音的突然消失把浅睡者惊醒，理想的淡出时长应≥30秒；仅有'定时'而无淡出功能的产品在助眠场景是明显缺陷92% similarUnverified定时关机若只有固定30/60分钟档位不实用，优先选支持渐弱淡出（fade-out）的机型，突然断音反而会惊醒浅睡者91% similar
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