The best alternatives to Sleep Master Sleep Mask are Neuroon Open, and Nebula Alarm Clock.
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Best alternatives to Sleep Master Sleep Mask
  • Advanced open-source sleep tracking EEG mask and band.

  • Every night you grow a star little by little while you sleep. When your alarm goes off in the morning you'll wake up to a brand new star, ready for you to collect. You have to hurry though, if you don't collect your star in time by completing a challenge, it will explode, destroying your night's work.