There are defensive sales ahead of 145.00 relating to these option barriers.
A barrier option gets knocked out (no longer exists/becomes worthless) if the level trades, hence the defensive sales ahead of 145.
US yields have dribbled down a little also.
And Powell is speaking Thursday.
If you are long USD/JPY the above are a few reasons to lighten up a little on approach to 145 if we see that in Asia today.