Even though they may be truly terrifying and stick with you, try your best not to worry about them.  Allowing them to cause your more stress and fear will only increase the likelihood of more nightmares in the future.  Try to focus on positive life events instead of fear and worry.  Thinking of a safe space or a loved one will help keep your mind in a positive space. Think of how much better your sleep is becoming now that you are improving it. As much as possible, leave any fears or concerns behind you as you lay down to sleep.  Dwelling on these negative things as you fall asleep will only increase the likelihood of having a bad dream.  As you fall asleep, focus your mind on the rhythm of your breath. Gently and naturally, follow your inhalations and exhalations with your mind. If your mind wanders, refocus on your breath. Focusing on your breath will allow your thoughts to pass by without disturbing your sense of calm. Try not to dwell on any thoughts as you fall asleep.  Let your thoughts pass by without focusing on them or making judgements about them. Throughout the day, pay careful attention to your thoughts.  If you find yourself starting to blow your fears and worries out of proportion, stop.  Catch these thought patterns and instead focus on positive aspects as best you can.  Keeping your problems in perspective will save you unneeded stress. Don't exaggerate any causes of stress, be as objective as you can. If you feel too stressed or find yourself focusing on negativity, try imagining a safe space.  By visualizing a safe space, you can find relief from the source of your anxiety for a time, allowing you to return relaxed and refocused.  Find a real, physical space that you can get comfortable in. Start to imagine your safe space.  Your safe space can be any place at all, real or imagined, that makes your feel secure and relaxed. Use all of your senses in your imagining of your safe space.  See, hear, smell, feel, and maybe even taste your secure and safe space. Be aware of your body and any...

TL;DR in Vietnamese:
Ngừng suy nghĩ về cơn ác mộng. Không nên mang theo tâm trạng lo lắng vào giấc ngủ. Đế ý đến lối suy nghĩ của bản thân một cách chặt chẽ. Tập hình dung về một nơi nào đó thanh bình. Xem xét một số hành vi của bản thân. Sử dụng liệu phương pháp tưởng tượng diễn tập.