I can relate a lot. For me it really started during the COVID period. I wasn’t working at the time because of the covid rules so I lost my job, so I spent most nights learning IT and cybersecurity skills and gaming with neighbors I had just gotten to know. We ended up doing mini‑LAN parties until 6 in the morning, and my whole rhythm flipped. Waking up at 1 PM, gym, studying, and then gaming again until sunrise it completely broke my sleep cycle. Even after COVID, I struggled for a long time to fall asleep at a normal hour. And for some weird reason, even today I can only fall asleep around midnight or 1 AM, even though I used to sleep around 11 PM before all that. So yeah, definitely a former bad sleeper here too.