No. In early 2020 we released a new version of the Aroma-Snooze sleep aid, which allowed the light and the sound functions to continue to operate regardless of if the water ran out or not. What this means is that the ultrasonic technology will still go into automatic switch off mode when the water runs out, but the light and the music will continue to stay on and will help your child to remain undisturbed.Please note, there are several sleep aids on the market where the sounds or lights will only run for a short period, or the lights and sounds will switch off when there is no water left. This is not ideal for a child as this change in sleeping environment whilst sleeping could easily startle them as they sleep.