Snoring can be a lot more than an irritant to a bed partner or others within earshot. It’s often a symptom of a more serious, life-threatening disorder called obstructive sleep apnea. If your partner tells you your snoring is interrupted by pauses and then gasps, it may indicate your breathing is stopping and starting, a hallmark of sleep apnea. 

It’s estimated that approximately 45 percent of the population snores and 25 percent are habitual snorers. One in 3 men and approximately 1 in 5 women who are habitual snorers suffer from some degree of obstructive sleep apnea.

An estimated 18 million Americans have sleep apnea, a pause in breathing that’s 10 seconds or longer. People with sleep apnea often complain of feeling very tired during the day. They may have trouble concentrating, or become unusually forgetful, irritable, depressed or anxious.

Sometimes they fall asleep at inappropriate times, such as during work or while driving. In fact, people with sleep apnea are two to five times more likely to be involved in a motor vehicle accident than those who don't suffer from this disorder.

You may have sleep apnea if you experience trouble sleeping, awake frequently during the night, thrash about or be told you gasp for air during the night. If you have sleep apnea it’s not uncommon to wake up with a headache and a dry mouth, to lose interest in sex or for men to experience erectile dysfunction. These problems can appear suddenly or over time. If you are experiencing these symptoms, don’t downplay them–make an appointment with your doctor. Untreated sleep apnea can have serious effects, including an increased risk of cardiovascular disease, strokes and mortality.

Sleep apnea isn’t just a problem for adults. If your child snores, squeaks, has trouble breathing or is very restless during sleep, understand this is not normal and may be a sign of sleep apnea. Older children may be sluggish, have trouble in school or even fall asleep in class. If your child is experiencing any of these symptoms, talk with his or her doctor.

If you’re having trouble falling asleep or staying asleep, you’re not alone. There are more than 60 million insomnia sufferers in the United States. 

Insomnia doesn’t just disrupt your sleep. It makes you feel sleepy the next day, too. Sufferers often lose their train of thought and are easily distracted from tasks they need to finish. Thankfully, advances in medicine and research mean physicians and sleep professionals can help most troubled sleepers.

People experience restless legs in many different ways. But most describe very unpleasant "creepy, crawly" sensations in their legs when they’re sitting or lying still, but especially at bedtime.

RLS can be very painful for some people, but the pain isn’t like that of a leg cramp. It’s also different from the feeling of a limb "falling asleep" when the blood supply is cut off. The pain and unpleasantness of RLS appear most often in the calves and can be temporarily relieved by stretching and moving your legs.

Although this happens most often when you’re awake, the constant need to stretch, walk or move your legs to get rid of the uncomfortable or painful feelings can make it difficult to fall asleep, and make you feel tired the next day. 

RLS can also limit the activities you can take part in. You may find it difficult to do anything that requires sitting still for long periods of time, including car rides and plane trips.

PLMD is another disorder that affects your limbs and your ability to sleep. The movements are involuntary and usually occur when you’re asleep. 

While most common in the legs, PLMD can also affect your arms. As the name implies, the movement occurs periodically, usually every 20 – 60 seconds. Typically the movements include a rhythmic extension of your toes, together with bending your ankle, knee or hip. The movements don’t usually happen all night long, but instead cluster in the first half of the night during the phases of light sleep. During REM sleep (when people are usually dreaming), the movements are much less common.

PLMD affects peoples’ sleep differently. Some may have trouble falling asleep, while others have trouble staying asleep. This difficulty sleeping causes some people to be very tired during the day. 

Periodic limb movements aren’t the same as hypnic jerks (night muscle spasms), the occasional jerks of your body that can occur just when you’re falling asleep. These jerks are normal and usually don’t cause a problem with nighttime sleep or daytime alertness.

Circadian rhythms are your body’s internal clock. They regulate your body temperature, sleep, wakefulness and a variety of hormonal changes. Sunlight and other time cues help you set your circadian cycles so they’re consistent.

There are a variety of common circadian problems:

• Jet lag and shift work
• Inherited circadian rhythm problems
• Delayed Sleep Phase Syndrome (DSPS)
• Advanced Sleep Phase Syndrome (ASPS)
• Inability to adjust to a regular sleep schedule
• Weak or nonexistent circadian rhythms