Good morning fuzzbutts!
As a quick tip today, look at yourself and the areas of your life that could get better. Not sleeping well, look up ways from articles on how to sleep better. Maybe you’re missing something like you need to keep the curtains closed! Waking up with a sour taste in your mouth? Acid reflux might be doing that and that will also affect your sleep so get it under control.
Get sad at certain moments? Look at your brain and maybe feel out what the triggers are. I noticed I can wake up pretty depressed but it’s usually because my sleep quality that night was so terrible.
There’s lots of small chronic things that seem so small and minor that we just feel that’s normal. It’s probably not, though! So try to catch areas of your health and look up the symptoms to see if anyone else has come across it. It’s up to you to realistically assess whether it’s an issue with mouth-breathing or if you have cancer (You probably don’t have cancer so at least try the other solutions first).