The secret is: the minute he falls asleep - get to work. Don't clean - don't wash - don't do anything else but work. Once he wakes up - change him or feed him or set him up close enough to you so you can see him (perhaps a playpen, but doubting he'll stay at 13 months - maybe get the interlocking rails/gates that form a circle around him large enough to play freely but not walk out into harm) give him toys, put a movie and perhaps he'll let you work if not, stay with him until his next nap. If working during the night is better for you, just make sure you sleep when he's sleeping during the day or you'll burn out.
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