The alarm sounds are the only plus.
Ive used this app for a week, and 2 of the last 3 days it has appeared to work normally, then not logged any data and told me Ive slept 0 hours. Nothing graphed, nothing logged whatsoever.
The app continually notifies me to upgrade to the "new" version (which is the version Im currently running), and every time I open it there is a popup that tries to get me to make a $1.99 purchase.
Save your time; this thing is useless.
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Sleep Science Alarm Clock