Procrastinating is putting something off for a reason, you usually do other things instead, which would indicate that you are not lazy, you simply don't want to do what you set out to for any number of reasons.
Being too tired is when you would like to do something, know you probably should but can't work up the energy to do it.
Laziness is when you do nothing with no excuse for it except you don't want to. Most of the time you don't even bother to make an excuse, that would be too much like work.
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