Looking for relevant tactics

Recently, AJ who was just shy of 8 at the time took to opera singing between 5:30 & 5:45 am. After requesting this behavior cease I of course began to look for a relevant repercussion for these antics, taking away favorite items such as play-dates, treats, soccer just doesn't feel right nor has it in the past had the desired affect. After pacing my bedroom in a sleep deprived fury it finally came to mind. Whatever time you get up in the morning is the time you go to bed!!! It worked beautifully, two night in bed by 5:45 and we had given up our early morning opera career! (note* he is welcome to sing between normal daytime hours)
Now...
Help me with this one what would be a relative repercussion for my 5 year old who just stood beside his brothers bathtub (with him in it) and peed in it!!!

Seriously where does one go with this one!?!?!