I have been waking up in the morning with the taste of blood in my mouth. yet, i haven't spit any blood up. i have also been sleeping a lot longer than usual. what could be wrong?

Many possible causes: Some symptoms can come from only a few types of causes. Some can come from many different possible causes, some possibly serious and some not. Your symptoms can come from many causes. When there are multiple possible causes, careful questioning and examination and sometimes testing are needed for you to learn which causes your problem. You need a professional health care provider to check you.

Many possibilities: it could be related in part to a local issue combined with an internal medical condition, these signs could indicate different problems in the same time. You could be having gum disease combined with a medical condition. You need to seek medical and dental advice. You will need proper examination and testing to,determine what is causing all this.

Gingivitis: Blood taste in mouth can be a sign that you are at risk for, or already have, gum disease. Untreated gingivitis can advance to periodontitis and can eventually lead to the tooth loss and other health problems. See your dentist ASAP because the sooner you treat it the better the outcome.