I use these headphones only for sleeping. The quality is plenty good enough when you want to drift off and easily matches any wireless earbud around the £100 mark. The audio clarity is surprising given size.
They really are tiny and can be fiddly to handle, in and out of the case, in and out of your ears. The fit inside the ear is very good which makes the isolation remarkable.
So I found the best use is to play a podcast that finishes, or play stops on a timer. Once the audio finishes you still have an isolating earplug.
I haven't used the built-in sleep sounds, some of the options are disturbing like a crackling fire. The built-in sounds are also easily loud. I mainly installed the app to upgrade the firmware and haven't needed it since.
I make sure the buds are fully charged before using them for sleep. The warning sound of low battery sounds like a loud explosion. However, I have rarely heard it, unless I had a restless night with about 2.5-3 hours of podcasts. If I drift off and the audio has stopped playing, the buds will retain connection and last all night and play in the morning.
The only drawback is my alarm on my phone plays through the buds very quietly.
