It could have been a combination of really good cannabis, it could have an Indica dom. strain. Indicas tend to make people very tired and lazy, and with the hot water in the shower. Using really hot water in the shower slows down your blood flow, that can result in lightheadedness, dizzy, and feeling tired.

That's why people say not to sit in a hottub for any longer than 30 minutes at a time, because it slows everything right down.

I'm sure it wasn't laced. People just don't seem to get the picture when others explain the concept of lacing cannabis. Lacing deals with adding other drugs, mainly harder drugs, to the cannabis to make it more "fun", I guess would be the word, but what people don't understand, is that for 3.5g's of cannabis, it's about $40. For a gram of b*** for example, runs about $60 a gram, so if someone were to add a harder drug to cannabis, they would have to sell that 1/8 for about a $100, and who is THAT dumb.

Lacing never happens as the dealer would lose big time money.

Anyways, I'm sure it was just good weed.