Halcion has a short half life meaning it wears off quickly so you won't feel groggy all day. It may or may not keep you asleep long enough to feel rested. It used to be more popular than it is now; lots of elderly people have had side effects that were troublesome and at times dangerous. I took it for a month and I liked it. It is a benzodiazepine so it can be addictive and also the effects can wear off if you take it regularly.