AT&T did a really nice commercial for their Mothers Day 2008 Samsung Mobile Phone promotion. You can watch it here:

This ad was the most searched ad on this website for the month of April. At first glance, if you do a search for the lines: "Daydream I fell asleep beneath the flowers, for a couple of hours", and you'll come up with what one would assume is the all the info about the song you need: "Daydream in Blue" by I Monster.  This is actually a remix of "Daydream (I fell asleep amid the flowers)" originally composed and recorded in 1968 by the Belgian band Wallace Collection.