I've read (or might be a YT video) that this could be genetic, some people have evolved to wake up at certain hours (something about provide protection to other tribe members). This is all from my recollection, so…
I've read (or might be a YT video) that this could be genetic, some people have evolved to wake up at certain hours (something about provide protection to other tribe members). This is all from my recollection, so…