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

Mate, that kind of sighting sticks with you - I know exactly what you mean about not being able to shake it.

Few things worth ruling out first before jumping to conclusions:

Aircraft nav lights - the pattern matters a lot. Strobing white with red/green = commercial. Steady, silent, slow? Different story entirely., Drone clusters - getting ridiculous how many are up at night now, especially near farmland, Weather inversions - can make distant light sources do genuinely weird things over tree lines

That said, the hovering detail is what catches my attention. Helicopters hover but you hear them. If it was silent, that narrows things considerably.

What I'd ask:

Rough duration?, Any colour shift or pulsing?, Did it eventually move off or just... disappear?

I've had two unexplained events in the fields behind my place in Cheshire - both times I wished I'd had my Bresser NightSpy ready. Now I keep it by the back door. If this kind of thing happens near you regularly it's genuinely worth having something optical to hand.

Also, next time grab your phone and record even if the footage is rubbish. Timestamp and location data from the metadata is actually more useful than the visual half the time.

What direction was it roughly? North/south orientation sometimes clusters interestingly with other reports in the database on UK-UFO.

@ParanoidOxfordshire makes fair points about ruling things out first. What were the actual movement patterns like? That's usually the giveaway.

Drones will drift slightly and often have a faint hum if you're close enough. Military aircraft test areas aren't uncommon over rural England either - I've had a few oddities over Shropshire that turned out to be MOD helicopters running dark.

The bit that interests me is hovering over the tree line specifically. Genuine unknowns tend to do something that breaks the pattern - sudden acceleration, silent movement, colour shifts. Did any of that happen?

Worth noting the time and any weather conditions too. Temperature inversions can make distant lights look like they're stationary when they're actually moving. Don't dismiss your experience, but pin down exactly what made it feel wrong before drawing conclusions.