Congrats on lucid dream! 
That's one weird way to get lucid, haha, dreams can be weird. 
Are you attempting DEILD? Check out this tutorial for some info on it: http://www.dreamviews.com/induction-...cid-dream.html 
It's not uncommon for some of first lucid dreams to be short due to excitement and similar, or maybe you were just at the end of REM, do not overthink about it though, you will have longer lucid dreams definitely, keep working on awareness and you could try some mantra while falling asleep like "I will be calm next lucid" or similar, think positive! 
Also you can give stabilization techniques a try: http://www.dreamviews.com/articles/9...-tutorial.html
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