Why is the quilt getting softer and softer when sleeping?

Never mind. The cotton wool is loose, thick and elastic, and it is warm to cover. After a long time, the quilt becomes softer and softer. Cotton wadding is not tight when it is pressed for a long time, and it is no longer as loose as it was when it was new, and its elasticity is poor. It feels a little tight, and the warmth retention effect is also reduced. At first glance, it's just that bask in the quilt and bask in the quilt don't often have to take a shot, which is why they are soft.