This happened in 2002 when I was living in a small village in North Wales. My then husband and I were using a guest bedroom for a couple of weeks while our room was undergoing some renovations. This was a village centre town house built circa 1880. I always felt it to be a happy warm home.
This night we had retired about 10.30, both of us were awake and reading each with a decent table lamp at the side of us. The room was well lit and both the door and the window were closed. I was laying on my side holding my book up when I first noticed what I first thought was smoke above my book.
My first thought was oh hell I've dropped a cigarette on the bed. (Yes I know, smoking in bed is unfortunately something I still do), I sat up quickly thinking the bedding was on fire when I suddenly realised I hadn't had a smoke since before I had come to bed. Looking quickly round for a source of fire I realised the 'smoke' was hovering just in front of me about a foot above my head.
For want of a better name I've always referred to it as the cloud. It was roughly the size and shape of a standard rugby ball but was most definitely shades of darkish grey getting lighter to the edges. I remember reaching up to try to touch it a few times but it always moved just slightly out of my reach.
I'm not sure how much time had passed before I turned to my husband and asked if he could see it. He said he could see nothing out of the ordinary.
I did physically shake my head and open and close my eyes a few times thinking I may be hallucinating as my husband was still insisting he could see nothing.
The cloud stayed for what seemed like ages then slowly began to move away from the side of the bed towards the wall opposite the bed.
Once it reached the wall it began to swirl and twist crazily,
Moving up, down, side to side faster and faster like a mad dance before suddenly stopping and moving down until it settled at the side of a monitor on a desk.
I can only describe what happened next as an explosion of silver shooting stars like a massive sparkler. It seemed to go on for ages with stars of all sizes shooting out for a couple of feet before disappearing. All of a sudden everything slowed down until there were just small stars exploding. They continued to get smaller and smaller until there was a last big flash. Then nothing. No cloud, no smoke, absolutely nothing left.
I got out of bed and went to the side of the monitor expecting to feel heat but there was no noticeable temperature change anywhere in the room I could find.
By this time I think my husband thought I had lost my mind as apparently as all the stars were shooting out I was saying things like wow, omg, you must be able to see this.
He still swears to this day he saw nothing but I have always suspected he also saw what I saw but he was the sort of bloke who completely disbelieved any sort of ghost or paranormal stories and always pooh poohed any 'such nonsense', though he did say the whole event seemed to go on for nearly half an hour.
To this day I still have no idea what it was I saw apart from I definitely saw it.
My then husband was willing to tell people he watched me watching something he couldn't see (if that makes any sense).
I have never again experienced anything even remotely like this but when it was over I felt incredibly peaceful and went on to have a really restful sleep.
Thanks for sharing this interesting experience, I don't really have much to add, other than I enjoyed reading about this odd cloud and it's odd behaviour. I thought you may find this encounter of interest. It's some 'curly smoke' moving about, observed by two people and their cat. Gotta love it when the cat gets involved!