Typically, the preferred sleep cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings.

通常，青少年的睡眠周期会延迟，这导致许多学生直到晚上很晚才感到困倦。

youdao

Mary was in bed, feeling sleepy.

玛丽躺在床上，感到困倦。

youdao

Keep the room cool rather than warm to avoid feeling sleepy.

保持房间凉爽而不是温暖，以避免感到困倦。

youdao

In online surveys, students reported feeling less sleepy during the day.

VOA: special.2010.07.07

If snoring is combined with feeling sleepy during the day and experiencing pauses in breathing during sleep, people may be suffering from the more serious sleep apnoea - which affects 10 to 20% of snorers - and should see their GP.

BBC: Snoring cures success 'exaggerated'