drowsier
1. If you are getting drowsier on successive days, then you are getting less than your daily requirement and should add 15 to 30 minutes to your sleep time.
如果接连几天都感到瞌睡，那么，你就没有达到每天所需的睡眠量，应该再增加15到30分钟的睡眠时间。
2. It works because it teaches your body that it can't catch up on sleep in the morning, so eventually you'll start feeling drowsier earlier in the evening.
奏效因为是它告诉你的身体无法在早晨补足睡眠，所以最终你会开始在晚上更早感到困倦。
3. A team of scientists from Oxford University in the UK have discovered the reason why people feel drowsier in dim lighting and more alert in bright white light.
英国牛津大学的一组科学家发现了人在弱光下更易瞌睡在强光下更警觉的原因。
4. Experiments created to replicate a medical resident's night on call found that people actually become drowsier if they take naps between tasks.
在值夜班的住院医生身上反复实验发现，如果他们在值班空档小睡，实际上会觉得更困。