Proofreading: Sleep Disorders
Print the following paragraph. Proofread and correct the errors in the paragraph by writing your corrections in the space above each error.

Sleep Disorders
Common sleep disorders that rob many people from a good night's sleep fall into four categories. The most common sleep disorder is insomnia. Insomnia is a general term; for conditions in which a person feels tired during the day due to difficulties falling asleep or staying asleep at night. Occasional stress causes some temporary insomnia however longer lasting insomnia may be linked to depression or anxiety disorders. A second category of sleep disorders is hypersomnia. With this disorder people sleep longer than normal. They often feel the need to take additional naps during the day. Despite the excessive hours spent sleeping. Hypersomnia sufferers continue to feel tired and fatigued. A third sleep disorder narcolepsy occurs during the daytime. Narcoleptics switch abruptly and without warning from an active, emotional waking state into several minutes of REM sleep. The decreased muscle tone causes them to collapse on the spot. And remain briefly immobilized even after awakening. Another common sleep disorder sleep apnea. People with this sleep disorder briefly stop breathing; while they are asleep. They abruptly jolt themselves awake to resume breathing. Because apnea episodes can occur hundreds of times per night sufferers do not feel rested in the morning. Each of these four common sleep disorders have one thing in common: the sufferers lack stamina during the day due to their sleep disorders.