I slept like a baby when I first tried this! I fell asleep so quickly and woke up feeling good for the first time in a long time. I decided to keep it on all night, and I think that helped me sleep longer, but you can also choose to keep it on for only 15, 30, or 60 minutes using the timer. The sounds are so crystal clear, very high quality audio; my favorites are rain, brook, and ocean.
The device itself is much more lightweight than I expected, but this small size coupled with the fact that you can use either the AC adapter or 3 AA batteries for charging makes it great for traveling! [This review was collected as part of a promotion.]