Our expert says:
The clenching of your jaw may represent a condition called "periodic limb movement disorder", or it may be telling us about anxiety.
Anxiety is the finest way to stay awake!
You are probably tired because of either insufficient quality, or insufficient quantity of sleep.
The good news is that these conditions are very amenable to treatment. However, you will need to find your way to a doctor who has training in sleep medicine. I'm quite sure that this can be sorted out.
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