Hair dryer sound is a relaxing sound effect which will help you putting your children to sleep. White noise reminds your baby about times when he was in mother's womb so child is more relaxed and sleepy. It's a great way for a parent to faster put the baby to sleep. It can be used instead of lullabies and other toy's sounds.
Use your phone to play white noises like sounds of hair dryer which will help your kid going to sleep!