Two Bright Flashes Lit Up A Clear Night Sky And The Interior Of My House

I didn't see an actual craft.  I experienced bright flashes of light around 2:30 AM.  I was lying awake in bed and a bright flash of light lit up the whole interior of my house.  I sat up expecting a thunder clap but none came.  About 5 seconds later another flash lit up the house, again with no ensuing thunder.
The flashes were way too bright, and had lit up the house too thoroughly to be a distant lightning flash and I suspected a storm was approaching rapidly.  
I got out of bed and went out on the porch to check it out, because I had windows to close if the storm would be a strong one.  I saw a perfectly clear sky with lots of stars visible in each direction.  
Nothing was amiss or out of place a the neighbor houses.  
I'm baffled as to what the huge flashes of light may have been.