We bought our current home just four years ago and in that time the bonus room above the garage has been a bedroom for our youngest son.......until he figured out that the room stays hot in the summer and cold in the winter. It also does not have a bathroom near so he had to come downstairs and across the house to use "his" bathroom. We have a guest bedroom on the far side of the house and "his" bathroom was just outside that room. The bonus room is actually one of the largest rooms in the house running the entire length of the garage. It has a small closet but with the angled ceiling, it is limited in what you can put up there. Also, no tall items can go on the edges of the room due to the angle. At the point where the ceiling meets the wall on the sides, the room is just 5 foot tall.
Once our youngest son decided it was not worth the hassle to stay up there, he "lived" in the guest bedroom until he moved closer into town to avoid the fuel costs of traveling to and from his college courses. After that, the bonus room became a storage area for things that we did not want in the garage. Now mind you, I learned you cannot keep candles in the bonus room as I had a Christmas arrangement stored up there and the 8 inch pillar candle now looks like a shepherd's crook! But......we continued to store lots of other things up there.
I have lots of sewing and stitching "stash" and it was the ideal place to store that since we use the smallest bedroom in the house as our computer room. I also don't currently have a china cabinet so it is also a good place to store extra dishes for the holiday seasons, decorations, etc. Our kids are grown and our only grandchildren so far are in Australia so we do not currently need a place for kids to sleep. The bonus room might one day be that place but for now, it is re-purposed to be a combination room.
When my dear husband retired from the Dept of Energy, he cleaned out his office and brought home about 13 records storage boxes of "stuff".....his awards, his work records (personal not work related files), his military records, lots of reference material, etc. Our goal since the New Year arrived has been to sort through our "stuff" and get rid of "stuff" not needed any longer. We've done well and now have it more organized. I don't have the messy before photos but here is what it looks like now!