Why is Minsc fatigued all the time?

Hi
Google did not help me. Why is Minsc fatigued all the time even though he is rested and not using his abilities? And how can i remedy it?
Thanks
Google did not help me. Why is Minsc fatigued all the time even though he is rested and not using his abilities? And how can i remedy it?
Thanks
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v2.3.67.3 (latest official, I think)
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Minsc is still getting Fatigued before everyone else. So weird.
@Shandaxx no, when I rest, he is rested too. But after some time he becomes fatigued before anyone else. I can live with that, but it's just annoying that he gets a penalty and keeps complaining that he is sleepy
@Grond0 oh, makes sense. me 19, khalid 17, jaheira 17, imoen 16, dynaheir 16, minsc 15.
I did not know that Con affected how fast one got tired.
EDIT: It even makes sense with this chart http://baldursgate.wikia.com/wiki/Constitution but it's weird that they haven't included the Base Fatigue stat in the Record panel