Is this a Sign of a Sleep Disorder?

So, I took a long nap today in the middle of the day because I had lost out on sleep the previous night and I was too tired to work on anything after class. It is honestly the strangest experience I've ever had. Obviously, I did not have to go to work and did not have a shift today but while I was napping, I dreamt that even though I wasn't going to work, I believed that I had already completed one of the work tasks (are completed 3 times every shift) for the day and needed to complete another in the late afternoon when I woke up. I was very confused and stressed while I was asleep and was fighting with reality, now what is this about, why do I have to do this when I am not actually working a shift? Then, when I woke up and I was definitely conscious, I was very confused for at least 20 minutes. It felt like reality was warped and I was very upset because I believed I had not been at work when I was supposed to. I just sat there in bed for 20 minutes trying to work out what was going on and I was fully awake.

I have never experienced anything to this extent, but I have had periods before where I've felt slightly confused a minute or two after I wake up but they're uncommon. I don't take any medications and don't have a family history of sleep problems.

I don't know if it is disorder or not but I can sympathize as this has happened to me one or two times. It is disturbing but I can't see it being harmful in any other way. I sometimes wake up from dreams that I went to work, then I have to get ready for work - thus I feel like I am doing a double shift. So the results of this lingers quite long. If you find out how to fix this then let me know so I can stop it too