Why do people buy methadone 10mg tablet and.cam you take ambien at night?

I don't usually post on this board, but your questions sent up a red flag. I'm guessing since this is in child and teen health, that you are in fact a teen or child. And I truly hope that your questions are asked out of curiosity. These are prescription drugs formulated for adults and should NEVER be taken unless under the direct supervision of a doctor. They can be dangerous and addicting. Ambien is a sleep aid, if you are having trouble sleeping, perhaps you should try some light yoga, or relaxation exercises about an hour before bedtime, don't eat just before going to sleep, listen to soft music.
To satisfy your curiosity about these drugs perhaps you could make them the subject of your next research project for health, or science class.
Talk to your parents regarding your questions about them.
And stay out of the medicine chest.