Some of the lyrics include:
Neend uth rahi hai chain ko raha hai
jaan ja rahi hai yeh kiya ho raha hai
ye kiya ho raha hai
aise na mujhe dekho mera dil dharak raha hai
yeh kiya ho raha hai
dude its from the movie "Hum kissi se kum nahin" called yeh kya horaha hai
No..that’s not it, but thanks for trying 
hmmm i thought it was from there... i can so imagine ajay devgan singing it...
unless its from Qayamat, but i doubt it
I think the song is from the movie 'kuch khatti kuch meethi' starring kajol. This song was on cable yesterday. Lucky for you :-p. I think I might have it in my pc somewhere, will upload agar mil gaya tu.