Insomnia is the most common sleep disorder. Insomnia is when you have trouble falling asleep and staying asleep. Insomnia could stem from stress, depression, anxiety, or a side effect from certain medications. Sleep Apnea - Sleep apnea occurs when gravity causes either soft tissue at the back of the throat to collapse or the tongue to fall back, obstructing airways. When your brain realizes the lack of air, it’ll send out a pulse, causing you to wake up and force you to breathe. These small intervals last up to 10 seconds, which could happen 30 times a night. These intervals are very short; you may not even realize you’re constantly waking up at night. Narcolepsy - Narcolepsy is when you feel intense sleepiness during the day and may randomly fall asleep. Researchers don’t know the exact cause of narcolepsy, and there’s no known cure. Narcolepsy can be treated with medications, like stimulants, to help boost the central nervous system and help patients stay awake during the day. Sufferers of narcolepsy can also make certain lifestyle decisions to improve sleep, including sticking to a bedtime schedule and exercising regularly. Restless Legs Syndrome (RLS) - People with restless legs syndrome experience an uncomfortable sensation, urging them to move their legs. This sensation disrupts sleep and may cause daytime drowsiness. RLS occurs mostly at night, when the body is slowing down to prepare for sleep, or during sleep.