Regarding my case matusiak explained it would be very rare for a mouse to be inside an interior wall but as he questioned me further we hit on a possibility.
Scratching in attic middle of the night.
Mice or rats are your likely culprit.
Raccoons are notorious for making themselves comfy in your attic insulation.
Scratching noise at night in the attic rodents.
Raccoons make very loud noises too.
Bats may form a colony in your attic but you ll hear them squeaking and scratching if they get stuck in the attic.
If the noises are only occurring during the day or at dusk and dawn check around the eaves for birds entering and leaving.
It could even be from the heating cooling system or branches of a nearby tree scraping against the roof.
With rodents you ll usually hear them around bedtime and late at night.
If you are hearing scratching noises specifically as well as scurrying sounds.
If you are hearing the noise predominantly in the middle of the night you almost certainly are sharing your home with rats or mice.
Ultimately an inspection of the attic will tell you what animal you ve got.
Pitter patter noises that are very fast at night may signify the presence of rats or mice in the attic.
Rats and mice can make quick scratching sounds at the door wall or close to the windows and even beside your bed.
Scratching type noises can be anything from mice and rats to a large nest of carpenter ants communicating back and forth to wasps hornets and yes larger rodents such as squirrels.
This one is a little more vague but of course thumping usually comes from larger animals so it s most likely from raccoons or opossums.
Houses whether new or old make plenty of noise.
So scratching sounds in the attic at night could be from a number of different nocturnal animals.
The explanation is much simpler than an apparition in the attic.
Both mice and rats make scratching sounds in an attic.
Occasionally when the house is very quiet you will hear them during the day as well.