I now ride with a tracker and one of those specialized helmets which senses a crash and informs an emergency contact.
Sensible advice, even if somebody knows where you are. My wife might know that I’m riding in such and such a place, but that doesn’t mean that she’d be able to find me if I didn’t return home, and even my MTBing friends who know all the tracks might struggle.
However, my gut feeling is also….. you were riding alone at night. Slow down and don’t assume that the track is clear ahead of you, you maniac! 😀 I hope you recovered fully, especially the broken skull bit.