White Pulsing Orb Above My Bed?

I am a teenager and I have been living a normal, good life - and still am. There is just one thing that is concerning me. I have lately been seeing this pretty small, flashing (a calm, usually steady) orb above my bed, and stays there until I turn on the light, or my TV. My grandma recently passed away, and I'm not sure weather this have something to do with it or not, but if that helps any. Has anyone else been going through this, and what is it?