Dream

Recently I have been dreaming a lot about snakes. The last dream was so scary that it felt so real. I dreamt that I was going somewhere and wherever I went there was a snake in front. Eventually I was at this place and sitting and opposite me was a lady and we were talking and besides us was a sleeping snake. My daughter then disturbs the snake and it just springs up and sinks its fangs into my right leg and I can feel the bite and also the venom seeping through my veins. I get up with a fright and I can actually feel the pain in my leg where the snake bit me. Please can you tell me why am I having such frightening dreams that it actually feels so real.