Trapped in a dream? Black and white dream?

So I've been watching some conspiracy theories on youtube and it made me remember something that happened when I was younger. I still remember it vividly, it was when I was in primary school and I was sleeping on the floor in my front room because I had watched a scary movie and I was scared. I feel asleep and, at first, I didn't realize I was dreaming because in the dream I was at school, nothing weird, but I soon did, my dream was in black and white and when I tried to wake myself up I couldn't. I was terrified. To wake up from this dream I tightly closed my eyes. I find it strange that I actually still remember this because I usually never remember my dreams! Did this happen because of anxiety, stress or something else? Why was the dream in black and white? I'm really curious…

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