Why do I fall asleep in the late afternoon

[capslock]

I can have a full nights sleep and still fall asleep around 3pm!. Even at work, I struggle to keep my eyes open at that time!. They literely close and I've actually put my head down on my break and fallen asleep!. I can't even fall asleep on an air plane or in a car but if I'm at work or home I just zonk out!.!.!.What do you think is wrong with me!? Should I be concerned cuz I amHow can i get to sleep in less than 20 minutes?

[meanne2007]

We have the same problem, since i have work at night, i have to rest in the afternoon, but unfortunately i can't sleep also...I experienced dizziness when i am trying to sleep hard. confused