Is it an age thing? I’ve been like this since late 40s, now mid 50s and I’m the same. It’s impossible to sleep beyond 5, and I’m usually awake at 4. DH is the same now, although he’s only been like in a couple of years.
I live on a street of mainly bungalows. Judging by the lights on from 3am, my elderly neighbours are all the same!