Just found some good information on Reality Checks. Some I knew, but others I did not so I thought I would post them somewhere on this site.
Breathing Can you breathe through a tightly shut nose?
If you’re swimming, can you breathe underwater?
Jumping When you jump, do you float back down?
Reading Do sentences change when you read them?
Read, turn away and repeat it to yourself, and then turn back and read it again. Do this twice.
Vision Do you have perfect vision? This only works for people who have at least slightly blurry vision in the waking world.
Hands Are your hands a strange colour, have too many fingers (sometimes they disappear and reappear when you try to count them!) or have other abnormalities?
Can you push your finger through your other hand?
Time Does your watch or clock tell a reasonable time? Are you even able to read the time off it? Sometimes clocks have the wrong number of hands or have strange symbols. Note: Digital clocks often work better for this reality check.
Powers Are you able to fly (just visualise it), unlock doors, or use other magical powers? Try to change the shape of your body, or walk through a wall, window, or mirror.
Light switches Does a light switch work?
Mirrors Do you look normal in a mirror?
Nose Can you see your nose with one eye closed?
Memory Are you able to remember how you got here, why you are here and what happened an hour ago? This is not always a reliable reality check!
Finger Stretching Are you able to elongate your finger by pulling on it? Body-image is malleable in the dream state, so this is quite reliable if you believe it will work. In the waking world you can pass it off as cracking a knuckle.