My kids had that phase. When they said that they were tired, they were made to take a nap for at least 5 minutes. Once in a while they'd fall asleep, probably from boredom, but most of the time they'd come back out and be 'refreshed'. I try to keep natural consequence, to being tired means you nap and being bored means you get assigned chores/something to do.
This is exactly what we do and it worked like a charm. I no longer hear that whine "I'm so booooored!" because he knows it means sweeping or folding laundry.
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Loving wife and a devoted mama to 13: three in my arms
(Hayden, Felicity and Teagan), and ten in heaven.
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