A down sleeping bag needs to breathe to regulate your temperature and allow moisture to escape. But this can result in the odd little down feather making its way out through the fabric or seams. This does not, however, mean your down sleeping bag is “leaking”. If you notice any feathers poking out through your sleeping bag, try to gently pull these back inside from the other side. The hole in the sleeping bag fabric should eventually close itself afterwards.
It is not advisable to pull the feathers out, as this may result in more feathers following. This is due to the structure of the down within the sleeping bag, as the individual feathers are interlocked. And by pulling the feathers out, you might end up creating a gap in the fabric.
So, don’t worry if you spot a few escaped down feathers in the morning. This is normal and won’t impact the insulation performance of your sleeping bag in any way.