OK, muse situation: Mine went on holiday for about a year. That's my fiction muse, who has only been around for about 3 years. My songwriting muse itched and bugged me for several generations but has taken a break for a decade or more. My cynic-skeptic muse fussed quite awhile too but has slacked off lately. And my tech-editing muse was fired.
Back to my fiction muse. After long quiescence, I'm getting more prodding, but very inconsistent. I recently poured out a trio of stories in about 2 days each. I got halfway through a couple more but they went sour. I'm cooking a few more but don't know how many I can squeeze out before I go on mostly-offline hiatus for a couple months. (I'll be traveling. Finally.)
My muse must be on drugs.
PS: Oh, you wanted sources of inspiration? I use songs, photos, paintings, memories, plagiarism, and brain farts. Whatever works.
Muse answer: I have a few. One is gorgeous middle-aged woman who really should stick to running a worker-positive brothel, but she gets bored easily and prods me to write. On the business side of things, I have another muse. She's a fatalistic, cigarette-smoking bitch (I don't smoke - she does) who would type until her fingernails fell off and isn't impressed when I'm doing things other than writing. She keeps me on task.
Straight answer: I get ideas from completely random places. It's just whatever happens to be in front of me at the time. I'm more inspired by things like random comments someone makes, a photograph of someplace interesting, or a line from an old movie. I don't like taking inspiration from real people. Historical characters are fine, because they're not among the living. For me, story ideas usually start with a dynamic between two characters and I build out from there.