So weird, part of the night sky tonight was blinking every five seconds.

It was to the west where I live. Overcast but still bright out, probably from the moon lighting up the sky? Anyway every like five seconds one patch of the sky would blink like a strobe. Why??

It's not my eyes because I rubbed them and looked out at another part of the sky and it wasn't doing it. I'm sober too so I'm not under the influence.