Saw something hovering over the tree line behind my house last night and I can't stop thinking about it

Right so you need to give us more detail before people start throwing drone theories at you. How big are we talking, and was it making any sound at all? That last bit matters more than people realise.

I've been doing this long enough to know that the hovering-over-treeline sightings are some of the most consistently reported encounters, particularly in rural areas, and they very rarely turn out to be anything mundane. Something about that specific behaviour - low altitude, stationary, then gone - comes up again and again in witness accounts going back decades.

What direction were you facing? And roughly what time? The atmospheric conditions last night over the south were actually quite clear which is both good and bad, good because you'd have seen it properly, bad because it rules out a lot of the "weather phenomenon" dismissals people love to reach for.

Don't let anyone talk you out of what you saw before you've had a chance to properly document it. Write everything down now while its fresh. Every detail, no matter how small.

@Suze49 is right that sound (or lack of it) is the key discriminator here. A drone at that range will always give you some rotational noise, even the quiet commercial ones. Dead silence combined with sustained hover is where things get genuinely interesting from a documentation standpoint.

OP what we really need is angular size - hold your thumb out at arm's length and compare. And did it maintain a fixed altitude or was there any drift? True hovering with zero drift in wind is actually quite hard to fake with conventional hardware at scale. Also what time roughly, because atmospheric lensing can do weird things to lights after about 11pm in certain humidity conditions but that wouldnt explain a solid object over a tree line.