My understanding from the lit, & experience, is that there's a natural high/mild-euphoria from moving to higher-altitude (despite slight cognitive impairment) f

My understanding from the lit, & experience, is that there's a natural high/mild-euphoria from moving to higher-altitude (despite slight cognitive impairment) for the 1st 24-48 hours. That can then give way to crankiness, until slower adaptation progresses. And: theres some evidence depression/suicide rates higher even at the mild elevations of places of like Reno NV (~4500'), Bend OR (3500'), or Boulder CO (5500').