I don't know about the OP, but when I get home I have to feed kids, feed husband, shout at kids, do washing, shout at kids some more.. etc,.
When/if I get to my studio the last thing on my mind is "I'll just spend a couple of hours installing updates, then I can go put another load in the washer..." Most of the time I pick up the nearest guitar and mess about for an hour or so. Or I'll be sat on the floor trying to untangle mic cables. Or sat on the floor with a soldering iron fixing mic cables...
If I load Sonar it's because I'm doing something specific, usually a week late, like mixing the last gig I recorded and the band keep phoning me "Is it done yet??"