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渐亮时长选30分钟为通用最优解：15-20分钟对浅眠者仍偏突兀，45分钟则容易在真正醒来前就适应亮度失去唤醒效果

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Unverified日出模拟时长选择30分钟渐亮而非15分钟：光照渐变应匹配人体睡眠周期尾段，30分钟能在浅睡阶段自然唤醒，15分钟对深睡者仍近似闹钟惊醒88% similar Unverified固定延时约15秒不可调节，如果只是短暂经过（如翻身、起夜快速返回），灯会持续亮着可能影响同床人睡眠；需要更短或可调延时的用户不适合84% similar Unverified落日模式（渐暗定时）的渐暗时长应可自定义，30-60分钟渐暗最符合入睡节律；固定10分钟熄灭的产品实用性较差83% similar Unverified选带'日落模拟/渐暗定时'功能的灯：入睡前15-30分钟自动逐渐变暗至熄灭，比手动关灯更符合助眠逻辑，30分钟渐暗档最实用83% similar Unverified日出唤醒功能应在设定起床时间前20-40分钟开始渐亮，且最终亮度需达到300lux以上才有效抑制褪黑素、促进自然清醒；渐亮时间过短或峰值亮度不足的唤醒灯效果接近普通闹钟83% similar

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