Signs of Alzhiemer's?

I really feel like I am becoming pretty forgetful. First I forgot to pass the CT phone to the afternoon shift person then I went to nap waking up thinking it's already sunday 7am when it was still saturday 7pm. Could these be early signs of dementia or is it just that I was way too tired? I definitely hope that it's the latter. So anyhow, had to make trip back to the hospital to pass the phone to the night shift person since there's no other way I can get the phone passed with it locked away in my locker and me only going to work monday night. How I wish that I had a car. Saves so much time when making that silly trip. Sigh.