That's not to say insomnia or other sleep problems are caused only by depression. Insomnia is the most common sleep disorder in the U.S., affecting nearly one out of every three adults at some point in life. More women suffer from insomnia than men, and as people get older, insomnia becomes more prevalent.
Antidepressants, especially when combined with talk therapy, generally help people recover from depression. Symptoms begin to improve within weeks for the majority of people taking antidepressants. And people who take antidepressants long-term -- up to 36 months -- have a relapse rate of only 18% compared to 40% for those who do not.
But if they work so well, why do so many people stop taking antidepressants within a few weeks of starting them? Or skip doses when they start to feel better?
Most experts agree that adults need seven to nine hours of sleep a night. But even without depression, according to the National Sleep Foundation, the average American only gets about 6.9 hours. When you add depression to the mix, the problems with sleep are compounded.
What's the Link Between Sleep Disorders and Depression?
Having a sleep disorder does not in itself cause depression, but lack of sleep does play a role. Lack of sleep caused by another medical illness or by personal problems can make depression worse. An inability to sleep that lasts over a long period of time is also an important clue that someone may be depressed.
What Is Clinical Depression?
Clinical depression is a mood disorder. It causes you to feel sad, hopeless, worthless, and helpless. Sure, we all feel sad or blue from time to time. But when you feel sad for long periods and the feelings become intense, the depressed mood and its associated physical symptoms can keep you from living a normal life.
Why Is Sleep So Important?
Normal sleep is a restorative state. However, when sleep is disrupted or inadequate, it can lead to increased tension, vigilance, and irritability.
Physical or emotional trauma and metabolic or other medical problems can trigger sleep disturbances. Poor sleep can lead to fatigue. With fatigue, you exercise less and that leads to a decline in your fitness level. Eventually, you find yourself in a vicious cycle of inactivity and disturbed sleep, which causes both physical and mood-related symptoms.