Take the end of the sheets and stuff them into the foot of the bed, making it hard to cover himself. Only do this until the edge of the pillow on top of the bed. This will make in more discrete.
 At least once a day take the objects he uses most and hide them in the most obscure places you can find.
,, Quickly get on and change his desktop picture. Alternatively, you could close all the windows and delete the history. This way, he won't be able to go back to his work easily. If your brother likes sitting in his room all day being lazy, put glue on his chair; he'll be so embarrassed
Short sheet his bed.
Hide his favorite things.
When he's asleep put his hand in a bowl of lukewarm water and he'll pee the bed!

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Hide marbles in his pillowcase.

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When he's on the computer, wait until he leaves to go to the bathroom.
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