Nikhil, I've used this one and it does work but in morning. After exercising him well, I keep a raw hide bone which he chews with great pleasure. At 8'o clock exact, he'll go under the table and falls asleep. I wonder, how dog are so punctual in timing. I think a lot is attributed to my lifestyle. I come late at night and my puppy simply expects me to be with him longer which is a fair expectation on his part. During my absence, he's like a gentleman sleeping, chewing, moving from one room to another and a little bit of playing. When I return back, he thinks his favourite play mate is back and he tried to play as much as he can.
I'm just waiting for him to grow up a little so that he can respect the fact that when I'm asleep he must not bark and remain quiet and fall asleep. Right now, he's still a puppy.