What Causes Shivering And Pain In Body?

I'm 14 and this morning i was waking up during REM sleep in which i was moving alot i could remeber what it was about but now i cant.When i woke up i was so exusted and hot i felt like i hadn't been sleeping at all ,my whole body was shaky and aching it was hard to walk . This is the first time it has happened.I don't normally nap during the day unless im sick and today i did for 2 hours?