Well, it all depends on your taste in movies and your mood at the time - and whether or not you're enamored of Sandra Bullock. If you enjoy the occasional romantic chick flick, if you're in the mood to watch something upbeat that's not too deep, and if you think Sandra Bullock is just fine, thank you very much, then this is the movie for you.
While You Were Sleeping was Bullock's first starring role after her blockbuster success in Speed, and it does a good job of showcasing her wide appeal to viewing audiences. She captures our support, trust, and interest from the very beginning, playing a Chicago tollbooth ticket-taker who has a 'thing' for a commuter guy she sees go thru her turnstile daily. Then he's mugged, she saves him, and somehow allows her family to believe that she's his fiancée - and then, the plot thickens. At the bedside of this unconscious guy, she meets his brother - and she falls even harder for him.
Okay, that's enuf: watch the rest of it yourself. Just be on the lookout for the scent where they're walking on an icy sidewalk - it's just awfully well done, as is the rest of the movie.
...but only if you like this sort of thing! I sure did.