I think it all depends on how much you're doing during the day, it could just be a normal thing. I used to get tired all the time (I'm diabetic) and yeah it does make you tired but the other symptoms come on so quick (losing weight feeling ill etc etc) but I still felt tired so I went back n did some blood tests and found out I had underactive thyroid soo now all I do is take a little tablet every morning (for the rest of my life though.. ugh) and it's fine.. so i'd get it checked out even if it's nothing