Freaking out and hoping this isn’t mice and is either lint or maybe a bug thing. I found this and only this on the top of a mattress in my attic (my bedroom) this morning (the mattress is not on the floor, if that makes a difference). 

The only issue I’ve had with mice up there in my 11 years of living here was one about a year ago and that was quickly caught in the attic closet during winter (it never got in the main room, there are no holes anywhere in the room, and not even my pinky cannot fit underneath the gap between the floor and the door).

I’ve been staying up all night quite often as-well (9 pm - 8 am) these past few months due to insomnia and have heard no activity. The last one I had heard moving about the walls, which is why it was so quickly caught. So I’m a bit confident I would’ve heard this one too, if there is one.

Also, I’ve been super anxious for a reason that is far too long to explain here and have therefore been inspecting my mattress and the area about it every 2-3 days to quell my anxiety about it. I have noticed nothing like this till today, though there is, in fact, other lint on the mattress (i know it’s that because it’s more loosely coiled and a bright blue)

TLDR: found this, and only this, on mattress in attic/bedroom, no droppings found anywhere in the room, have heard no night activity, and have checked mattress and surrounding area frequently (due to other reasons) and haven’t noticed anything like this till now.

Please let me know what you think!

Mouse dropping?