When you doze off sleeping in the Daytime and wake up you feel totally out of it?

Sometimes when I come home from school I sometimes lie on my bed and start relaxing then wake up a few minutes later and tstart thinking from the moment I woke up that everything's now a dream (real life now feels like a dream when it isn't when i wake up).

I never sleep in the daytime, it's not my thing.. but everything turns unreal when i wake up from my time-to-time rare occasional minute naps... anyone help?

I'm not going to the Doctor'w or anything.. :l