Sleepme Leak

I have the a station for each side of the bed. Mine works fine, but my wife's is always out of water and i've concluded there is a leak because the nearby curtains are often damp. However, i have been unable to spot the leak, since there isn't just a puddle or visible leak. also, i've noticed that when i look at the history on her app, it will say that it's out of water, water refilled, then out of water about 100 times a night. any ideas here on how to address this? it's incredibly frustrating.