I was on a thread about reality checks and I saw this.

"5. Turning the lights on/off
When you are dreaming, one of the things some people are unable to do is adjust the light level of the settings you are in. If you try to turn the light switch on/off and nothing happens then there are 2 possibilities:
a. You are dreaming
b. The light bulb burnt out the light switch doesn't work for some reason."

I constantly have this nightmare in which I am in a pitch black room and I am late for school/work/etc. and I really have to leave this room to get there. The problem is, I can't find the door or the light switch. I know where the light switch is though.
I am frantically running around the room, panicking trying to find the light switch. My body and my head aren't both controlled by me though. I will run toward where I think the light switch is, and my head is thinking "finally, I can turn on the light and leave." but as I'm about to turn on the light, my body turns away without my heads consent and the panicking continues until I wake up.

Can anyone explain what this dream is about and why one can't change light levels in dreams.. It'd be really helpful to know, maybe the answers could lead to me chilling out in this dream instead of freaking out.

(Also, I'm posting this here because this is my first time posting and frankly, I don't know the most appropriate place to post this)