[choko]

Many people use marijuana for sleep. Are you really sure no one has ever fallen asleep at the wheel due to marijuana use? It seems like a bold claim.

[leptons]

Marijuana and alcohol differ significantly when taken in large quantities. Alcohol will make a person pass out without exception. Marijuana does not specifically make a person pass out at high doses. You would need to take a low dose of marijuana to use it as a sleep aid.