Hello Hair is falling out heavily, there are many, too many hairs, fo…

Hello Hair is falling out heavily, there are many, too many hairs, for three weeks now. I pull them out in clumps ? What could this be? There were no stressful situations, everything is normal with my head, I try to eat properly, I can afford a little sweet treat. But I don't sleep enough. Is it because of not sleeping enough that hair is falling out so much? Are there any other options, maybe something I am missing?