My Philips SmartSleep Deep Sleep headband keeps sliding off during the night

I am not hearing anything while sleeping. Is Philips SmartSleep Deep Sleep Headband working?

My sleep graph says I woke up many times, is it ok?

I cannot sync the Philips SmartSleep Deep Sleep Headband with the SleepMapper App

Using the Philips SmartSleep Deep Sleep Headband without syncing with the SleepMapper App

How do I set up my Philips SmartSleep Deep Sleep Headband?