Is it normal that i can't sleep at night?

You have to sleep shirtless. If you sleep shirtless you're going to sleep better. Believe me

Possible Causes-You should go to a doctor. Are you in any medicine? Some medicines give people horrible insomnia. I remember when I was on lamictal, I couldn't sleep a wink. You could also have sleep apnia.

Hallucinations-If the hallucinations are sudden, then it's probably a side effect from the lack of sleep. Make sure to tell you doctor this and if it was sudden or gradual.

For the nightmares-Before you go to sleep, try to do something relaxing such as reading a book. Try not to look at horror movies or video games. I used to have really bad nightmares but when I stopped playing horror games before I went to sleep, they went away.

The act of killing in a dream need not be negative. As we grow and change, it often feels like we are killing a part of ourselves during periods of transition. Alternatively, killing in a dream may mean that you have murdered the incentive and enthusiasm for life.
Dreaming of death does not necessarily symbolize physical death, however, it can represent a fear of it. Violent death can symbolize anger and aggression. To dream of dying, especially if you are unhappy or distressed about it, can signify a letting go of something. It could be an old part of yourself, an old portion of your life, or a close relation or friend. However, to dream of a lifeless corpse can represent a weakening state or a kind of death in your life that comes from devoting yourself to a miserable and lifeless routine.

well u seem to be scared somthing is gonna happen u should realy consider seing a therapist or trying to minipulate and lucid dream

i had this b4 and now i sleep in the mornings instead of night.

You need to see a dr. ASAP. Take Tylenol PM or Benadryl in the meantime and see of that helps. Good luck, and please get help.