It usually is. If you've been doing the nose pinch reality check during the day at all, your brain might be generating the "reality" results of your check. There are a few ways you can fix this, but the one I use is to believe completely that I am in a dream. I get excited (but not too much! You don't want to snap out of it) about what I'll do next. I'll be thinking about all these dream qualities I can do, and the test will prove that I can. So I won't be focusing completely on the sensations of my hands or my nose, because then my brain will produce real results. I'll devote maybe half my attention elsewhere, and then realize that hey, I'm breathing through my nose.
You might want to do more than one reality check. Cycle through as many as you can. If you're in a dream already and you didn't WILD or DEILD or some sort of waking transition, reality checks really only come second to that burst of awareness where you realize, "I'm dreaming!" I've read stories on here about people who are told to do a reality check inside a non-lucid dream, and even when the results show they're dreaming, they don't gain awareness in the dream.
A good way to reality check is to be completely critical of your surroundings and of the logic that brought you there. In a dream, unrealistic things often seem completely logical, even expected. It's only until you wake up that you realize something was strange. Perhaps use the
Sporadic Awareness Technique during the day. Ask yourself why there's a light show in your school. Is it normal? What are the reasons behind it? Are those reasons normal? Can you think of your school back in "real life"?
Good luck.

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