**What am I?**

They put pictures on me  
then take pictures of me  
to share with the world  

But the pictures disappear  
as my end draws near  
and anxious heartbeats stilled  

I am sought after very wide  
especially after every night  
when things are put in motion  

And after a little while  
I will be able to defile  
your ability to sleep with devotion  

>!This riddle has been validated through Sandbox submission: [here][1]


  [1]: http://meta.puzzling.stackexchange.com/a/5292/10327