Yes, it is possible for both adults and children to get so used to their sound machine, says Dr. Dimitriu, that it leads to a “mild dependence on sound machines that forms over time, much as how people get used to their bedroom or favorite blanket.” This could make it more difficult for you to fall asleep somewhere that’s quieter than you’re used to—like hotel rooms, different houses, etc.  However, “It isn’t a bad form of addiction,” says Bates.