Excessive sleepiness or drowsiness refers to the urge or tendency to fall asleep when you are required to be awake, especially during daytime hours. When you feel excessively sleepy, you …
You usually sleep for seven to eight hours, yet still feel sleepy in the morning. What causes this, and how can you change it? Sleep experts weigh in on possible culprits and share how you can...
If you’re getting enough shut- eye but still feel sleepy all the time, you could have a sleep disorder. Sleep disorders disrupt a person's ability to fall asleep or stay asleep, or they …
Overview. Insomnia is a common sleep disorder that can make it hard to fall asleep or stay asleep. It also can cause you to wake up too early and not be able to get back to sleep. You …
It is normal to feel tired after a night of poor sleep, but for 10% to 25% of people, tiredness is an ongoing problem. Chronic fatigue or sleepiness may result from stress, physical or …
更多内容请点击：What Causes Excessive Sleepiness? - Sleep Foundation