A few reasons.. not all apply every time.
Your nervous system only processes so many things at once, when you’re resting… Less to process and youre able to “realize” all the little aches and pains.
Inflammation, or swelling redirection of blood/fluid changing pressure.
Your “mind” is more aware of things
Relaxing or preparing for sleep initiates rest, stops release of pain stopping/reduction.
Also, if you’re referring just to the sensation of feeling tired, that’s kinda just fatigue. It’s a natural reaction your body will have when ready for sleep.
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