the feeling of needing sleep or being ready to go to sleep 困倦的;瞌睡的 If you have excessive daytime sleepiness, consult your doctor. 如果你白天过度嗜睡,咨询你的医生。
the quality of being quiet with nothing much happening 嗜睡: 安静无事的质量The small town had an air of afternoon sleepiness. 这个小镇弥漫着午后困倦的气息。