My behavior changed when I went from accumulation mode to FIRED mode.
When accumulating, I did a full net worth calculation once a year in January.
For the rest of the year I tracked contributions to the stash each payday but didn't follow the market at all during the year. That way, if the market went up at all during the year, I was pleasantly "surprised" at the higher balance. My forward FIRE plans were based on contributions, not on market growth. I.e., 0% market growth. At the end of the year, I updated balances to account for market growth or its opposite.
That way I got to FIRE earlier than predicted, which is a lot easier to accept than the other way around.
All of that is silliness, but it worked for me.
This year, our FIRE year, I've been tracking net worth at least monthly and also when a big dip or rise was reported. I wanted to get used to "losing" $100,000 in a day when I knew it really didn't matter. I put "losing" in quotes because I still own the stocks, so I didn't really lose anything.
This month I've gotten so used to the ups and downs of this year that I haven't bothered to do a calculation after the drops. So I guess my mental innoculation strategy has been working...