Yet another sleep post

Anyone else's little one going to bed at 11pm - 12am and waking up at 5am looking like they're ready to get up for the day? That's like putting them to bed at 6pm and them waking up at 12am.. I know there's probably nothing I could do to change it and it will pass but I guess I just want to know it's not just us. Is this some sort of sleep regression or something?