Who turned the lights on

I have little Mollie sleeping on my bed, she’s tiny and I never normally know she’s there . 1.30am she jumped on me. I checked on her and she was sat bolt upright looking towards the window . Moments later the lighting started , on and on it went . Lots of quick short flashes regularly. A while later the thunder was overhead . It was some storm . Just before 4am I got back to sleep . Poor Mollie was a shaking wreak .