Ok I had never tried and item like this, I had always used the sound of a TV to make me go to sleep and the results were always different.  I used the thunder sound effect for 30 minutes and I seemed to go to sleep in no time, this was shocking cause I am a toss and turn type of sleeper and this could go on for hours and some nights were just a lost cause.  My daughter saw that I had one and asked if it had the white noise, I said yes it does I said it has 6 different sounds well she wanted to take it to her room, I said you can take it after I pass out, looks like I need to get her one.  The volume is adjustable which I loved and has different time settings also another plus since it turns itself off. [This review was collected as part of a promotion.]