Good advice from Jammy there

And yes, reality checks are about belief, and the expectation.
Thats why different reality checks work differently for different people.
For example - I can read perfectly in my dreams, but thats meant to be a reality check!

So if you can't put a finger through your hand - try something else.
Look in the tutorials section for a nice list of reality checks

Personally, I use (1) look at hand, check its normal - count fingers. Make sure you can count (2) Question how you got to where you are. And what did you eat last. Does it all make sense? If you cant answer ... then get suspicious (3) Close your nose and keep breathing. Make sure you closed your nose properly, and for an entire breath or two. I've failed this one before because I got lazy on it...