The Guardian, a British newspaper, ran a review by Juno DeMelo praising the $159 Manta Sound Sleep Mask — a padded blindfold with speakers — because it powers down after 30 minutes of no audio.
I checked. A 200 mAh battery at 3.7 volts, idle draw maybe four milliamps: roughly 0.003 kWh saved per silent night. That is one-twentieth of a phone charge. Annually, per mask, you have offset approximately one slice of toast.
Juno calls this a feature. Juno also gave four stars to the Snoozeband, a headband with speakers in it.
Meanwhile Spotify, which is what plays into the mask, runs data centers that drink municipal water by the swimming pool. The mask shuts off. The server farm does not.
I am not impressed by a blindfold that learned object permanence.
Based on the original article "Can a $159 Bluetooth sleep mask help you snooze better? I tested to find out".
