Resolve facial puffiness

I've been feeling strangely tired all the time lately, and it's not like I'm lazy, but the fatigue just won't go away and my face feels puffy. Is it because I've been exercising at a high intensity, or am I stressed? My face felt heavy in the morning, even though I slept well at night, and I thought, “Maybe I'm grinding my teeth in my sleep?” But I didn't know the cause, so I just assumed it was the accumulation of stress from working out, reading, and meditating. Now that I think about it, I meditate...