Possessed said:

Weed wouldn't explain the chanting though. Maybe if it was the first time he'd ever done it, but you say he does it regularly for a long time so I'd say he has some other sort of condition, and the weed may be bringing that condition out.

Either that or he's doing some other drugs as well.

Yes it's all very strange. I meant that it goes on for a couple hours at night, and it's been happening the past few nights, but the whole first month of school nothing was happening and all was quiet.