I’ve got 2 and in my experience they’ve worked for me First has always been a good sleeper but would sleep till 8 in the morning with a black out blind! Second is an early riser and opens his eyes the second he sees light so they’ve really helped us. 5:30 get ups always put me on my backside though, especially when I’m up during the night too, like a walking zombie so always been grateful for the extra hour!They dont really help to be fair. I've 2 kids, always been early risers, and no amount of late nights, changing routines, gro clocks, black out blinds helped. They are what they are, they are now 8 and 6 and still get up at 6am. Its just who they are, I just have to roll with it.