Unsettled about being Unsure

Do you ever have that feeling that you know something's supposed to get done, but you're not sure what? Or you know you're supposed to do something? Or something is a little off? I'm kinda feeling that way right now. I think it's because I'm supposed to do something next time I'm online, and here I am, and I don't have any idea what that something may be. If anything at all.