why do people with PTSD often have sleeping problems?

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There are many reasons why people with PTSD may have trouble sleeping:

Changes in your brain:

PTSD can cause changes in the brain making it difficult to sleep. Many people with PTSD may feel they need to be on guard or “on the lookout,” to protect him or herself from danger. It is difficult to have restful sleep when you feel the need to be always alert.
Medical Problems:

There are medical problems that are commonly found in people with PTSD such as chronic pain, stomach problems, and pelvic-area problems in women. They physical problems can make going to sleep difficult.

Your Thoughts:

Your thoughts can make it difficult to fall asleep. People with PTSD often worry about general problems or worry that they are in danger. If you have not been able to sleep for several nights (or even weeks), you may start to worry that you won’t be able to fall asleep. These thoughts can keep you awake.

Drugs or Alcohol:

Some people with PTSD use drugs or alcohol to help them cope with their symptoms. Drinking and using drugs can make it more difficult to fall asleep.

Upsetting Dreams or Nightmares:

Nightmares are common for people with PTSD. Nightmares can wake you up in the middle of the night, making your sleep less restful. Or, you may find it difficult to fall asleep because you are afraid you might have a nightmare.

Hearing a Noise:

Many people with PTSD wake up easily if they hear a noise. You may feel that you need to get up and check your room to make sure you are safe.