Feeling abnormally sleepy or tired during the day is commonly known as drowsiness. Drowsiness may lead to additional symptoms, such as forgetfulness or falling asleep at inappropriate times. A variety of things may cause drowsiness. These can range from mental states and lifestyle choices to serious medical conditions. Certain lifestyle factors may lead to increased drowsiness, such as working very long hours or switching to a night shift. In most cases, your drowsiness will subside as your body adapts to your new schedule. Depression can greatly increase drowsiness, as can high levels of stress or anxiety. Boredom is another known cause of drowsiness. Some medical conditions can cause drowsiness. One of the most common of these is diabetes.

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OTHER WORDS FROM sleepy
It can be miserable to feel too sleepy. If you always have trouble staying awake during the day, you may wonder, "Why do I feel sleepy all the time? First, there are some important signs that you may be feeling too sleepy.
What is a sleep disorder or sleep problem?
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It is important to differentiate sleepiness from tiredness. When we feel sleepy, it is a conscious struggle to remain awake. On the other hand, when we are tired, we may feel fatigued but still remain relatively alert. You could think about this distinction by associating tiredness as a physical symptom experienced in the muscles in our body. Sleepiness however, is more like 'brain tiredness'. It's a good idea to try to keep all your sleep for night-time, so if you feel mildly sleepy during the day do your best to counteract it. Exercise at lunchtime can be a good idea — a brisk walk perhaps. Getting out in the daylight is very important because natural light helps keep us alert.