The question will sound strange (or silly): A few weeks ago i bought an anatomisch pilow and slept on it for a few nights. Every morning i used to find some fallen hair on the pillowcase. This pillow is harder than the old one and the pillowcase not smooth. Of course i washed it before using it I changed the pillow a few nights ago and use my old one again ( very soft with smooth plilowcase ). NO fallen hair in the pillowcase in the morning!!! What could be going on?
The hard pillow may be rubbing your scalp as you move around in your sleep and putting traction on the hair. We lose 100-150 hairs per day and this may be some of those hairs that will fall out anyway. I would not expect you to lose hair that is not due to fall out in the next day or so, though this is just an educated guess!