How come some mornings when I wake up, im covered in blood from a nosebleed? Is this common or should I be worried?

Mucosal tear. Cause mucosal tear in nasal mucosa. Be worried enough to see ENT doc ASAP.
Get checked. Not normal you have a sinus problems or fragile vessels, needs to get checked by ent.
See ENT. Likely the bleeding is comming from fragile vessels n our septum which can be cauterized in the office. An endoscopy of your nose should be done to rule out any other possiilities.