@zhanglizoe,
A Mickey Finn is an unexpected/unwanted sleeping draught. Think date rape drug although it's not necessarily for the purposes of attacking someone sexually (in fact, in old movies, it's usually just to knock someone out).
Anaesthesia is administered by a doctor when you're undergoing an operation. I believe the oldest form of anaesthesia used (and it's not really used any more) was ether. There can also be anaesthesia that kind of half knocks you out but doesn't really make you sleep, like nitrous oxide (laughing gas), which we often get at the dentist's office because you need to be conscious enough to be able to respond to a dentist's requests to open your mouth wider.