Narcolepsy is a sleep disorder that affects your ability to wake and sleep causing sleep paralysis, excessive sleepiness, hallucinations, etc. It is known to affect 1 out of 2000 people. A typical sleep cycle is often characterized by its various stages, the final stage being Rapid Eye Movement (REM). An average person enters REM sleep 90 minutes after sleeping. However, a person suffering from Narcolepsy reaches the REM sleep immediately. He/she might reach this stage even when they’re awake. This makes it difficult for the person to perform his/her routine tasks as he/she feels sleepy during the day even after a good night’s sleep. The cause of this problem is linked to the loss of a chemical called Hypocretin in the brain. Hypocretin is responsible for regulating sleep cycles and keeping us awake. On the other hand, problems such as Shift Work Sleep Disorder that disturb the circadian rhythm of a person make him feel lethargic throughout the day and he finds it difficult to stay awake and alert for long. Shift Work Sleep Disorder is common among people working in rotational shifts, late-night shifts, and early morning shifts. It occurs as the natural sleep cycle of the person gets affected. This causes chronic sleep deprivation and also deteriorates the health of a person. However, with the help of certain medications, these problems can be treated effectively. Medicines such as Modalert 200 mg, Waklert 150 mg, etc. help to promote wakefulness in patients suffering from sleep disorders. These medicines work by preventing the reabsorption of dopamine. They increase the activity of orexin, histamine, and norepinephrine in the hypothalamus of the brain. This helps to improve focus and concentration, and the person feels energetic throughout the day. The effects of these medicines are known to last for a period of 14-16 hours. Following the doctor’s prescription is necessary to treat the ill-effects of this problem. Your doctor will suggest a suitable dosage after examining your condition properly.