The other day...

at my son's occupational therapy appointment (for his handwriting/dsygraphia) he kept yawning.  The therapist asked him why he was so tired.  I told her that I'd made him go to bed at the regular time but had heard him moving around quite a bit later and had to tell him several times to "just go to sleep".  He didn't go to sleep but just got quieter so that I would go to sleep.  His therapist, Ms. Joyce, asked him what he did after he was supposed to be in bed and he said "First I built a fort in my bunk, then I invented a board game and then I read for a while." 

No wonder he was tired.