I am going to use one for sleep.
I've used the company's other machines before.
But, the machine I used before, the Sound+Sleep™ machine, seemed to last ~2 years before the internal power supply would go. At $100+, that was expensive.
Also note that a few comments on the interweb said that this sound machine was able to produce over 100 decibels of sound - that's *extremely loud*!
The review I mentioned above, showed that this sound machine, like the other sound machines, stayed under the 85 decibels level suggested by the World Health Organization.
Note that even ~80 decibels is very loud! :-)
For what it's worth, people and other animals are "sensitive/bothered/annoyed" by different sound frequencies.
I'm also going to use one in my garage and one in my shed at the highest volume and frequency.
I already have existing ultra-sound pest deterrent sound machines.
Hopefully, both sound machines will convince any mouse to go look somewhere else for shelter. :-)