Anxiety can cause insomnia, and insomnia can cause anxiety.

Anxiety, stress, and depression are some of the most common causes of chronic insomnia.
Having difficulty sleeping can also make anxiety, stress, and depression symptoms worse.
Other common emotional and psychological causes include anger, worry, grief, bipolar disorder, and trauma.
This can result in a self-perpetuating cycle that may lead to chronic insomnia.

Short term anxiety develops when you worry frequently about the same specific issue, such as work or your personal relationships.
Short term anxiety usually goes away once the issue is resolved.
Your sleep should return to normal as well.
People can also be diagnosed with an anxiety disorder, such as generalized anxiety disorder (GAD) or panic disorder.

These disorders can result in varying degrees of insomnia.

When an individual faces potentially harmful or worrying triggers, feelings of anxiety are not only normal but necessary for survival.
Since the earliest days of humanity, the approach of predators and incoming danger sets off alarms in the body and allows evasive action.
These alarms become noticeable in the form of a raised heartbeat, sweating, and increased sensitivity to surroundings.

The danger causes a rush of adrenalin, a hormone and chemical messenger in the brain, which in turn triggers these anxious reactions in a process called the 'fight-or-flight' response.
This prepares humans to physically confront or flee any potential threats to safety.

Symptoms:
1. restlessness, and a feeling of being "on-edge" ;
2. uncontrollable feelings of worry;
3. increased irritability;
4. concentration difficulties;
5. sleep difficulties, such as problems in falling or staying asleep.

Possible causes include:

1. environmental stressors, such as difficulties at work, relationship problems, or family issues;
2. genetics, as people who have family members with an anxiety disorder are more likely to experience one themselves;

3. medical factors, such as the symptoms of a different disease, the effects of a medication, or the stress of an intensive surgery or prolonged recovery;
4. brain chemistry, as psychologists define many anxiety disorders as misalignments of hormones and electrical signals in the brain;
5. withdrawal from an illicit substance, the effects of which might intensify the impact of other possible causes.

Anxiety disorders

The duration or severity of an anxious feeling can sometimes be out of proportion to the original trigge, or stressor.

Physical symptoms, such as increased blood pressure and nausea, may also develop.
These responses move beyond anxiety into an anxiety disorder.

Panic disorder

Brief or sudden attacks of intense terror and apprehension characterize panic disorder.
These attacks can lead to shaking, confusion, dizziness, nausea, and breathing difficulties.
Panic attacks tend to occur and escalate rapidly, peaking after 10 - 15 minutes.
However, a panic attack might last for hours.