You can delete your history then disable history so YouTube won't store the videos you watch. Recommended videos are there based on other videos you've watched. Go to history and press or click where it says pause viewing history. I'd recommend to delete history before pausing it.
Ambien is the brand name for zolpidem, a drug that's used to treat insomnia. Insomnia is a sleep disorder that makes it difficult for you to go to sleep, stay asleep, or both. Ambien is in a class of drugs called sedative-hypnotics.
The whole motivation for taking Ambien in the first place is presumably to cause unconsciousness so this defense doesn't really apply either. Ironically, you are more likely to be successful using the Ambien defense if you injure or kill someone than if you just crash into a parked car or a tree.