Do you have a daily speed limit?
i have noticed this while driving.
there are some days when i seem to be happy driving at 40.
and some other days, when anything less than 60 feels very slow.
this is irrespective of traffic conditions.
the same applies to some other tasks as well. long pending things are not necessarily big tasks that require a lot of effort. just that it gets postponed.
and when in a mood, many things seem to get done quickly.
this is from clearing the clutter in the drawers or rooms to clearing the mailbox!