Can't Sleep, Anyone Else?

Does anyone else have nights where they just physically can NOT sleep? I used to have terrible insomnia, but that past couple years I've gotten it under control. But there are some nights where I am just wide awake for seemingly no reason. I'm wide awake, unable to sleep or even feel tired until sunrise, mind racing, ect etc. Manic is the best way I can describe it. It feels like what it felt like during a Lexapro-induced manic episode when I was wide awake and didn't think I needed sleep. But it's not a manic episode because it's only one night every now and then, and this has been happening for years. It hasn't happened for a while, not since I moved out (about two years ago) but it's recently come back. Idk if it's, like, a stress thing or an illness flare thing or what. If anyone else experiences this and/or knows why this might be happening, please let me know. I will be so grateful 🙏