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There are many factors that affect a person's sleep. Stress is the number one cause of short-term sleeping difficulties. Stressful situations include school- or job-related 1)____, and serious illness in the family. Usually the sleeping problems 2)____ when the stressful situations pass. However, if short-term sleeping problems are not managed properly from the beginning, they can last long and thus 3)____ good health. Unhealthy habits may lead to sleeping problems too. Drinking coffee or 4)____ in the afternoon or evening, exercising close to bedtime, following an irregular morning and nighttime schedule, and working or doing other mentally 5)____ activities right before or after getting into bed can interrupt sleep. Traveling also 6)____ sleep, especially traveling across several time zones. This can 7)____ your biological rhythms and cause sleep disorders such as trouble falling asleep and trouble remaining asleep. Environmental factors such as a room that's too hot or cold, too noisy or too bright can be an obstacle to sound sleep. Other influences to 8)____ are the comfort and size of your bed and the habits of your sleep partner. If you have to sleep beside someone who has different sleeping habits, breathes in a noisy way, or 9)____ other sleeping difficulties, it often becomes your problem too! Having a 24/7 lifestyle can also interrupt regular sleep patterns. Industries are working round the clock to be 10)____, so some people have to work at night; with nonstop automatic communication systems, people are communicating day and night. All these make sleeping at regular times difficult.