Yeah, if it's hot I can NOT get to sleep for anything!!

Mmm - the fact that you woke at just about your normal time implies to me that you were probably at the end of your REM period and your mind/body were going into wakeup mode. If it happened in the middle of the night or like an hour before you normally wake then it would seem the dream cause you to wake (though even still, a noise outside or some internal body issue could have woke you and sparked a moment of internal awareness as you were waking).

But I'm no expert - far from it! So I only offer my ideas for your consideration.