Pokémon Sleep app now available, turns sleep into game with rewards

Pokémon Sleep app launched in US tracks sleep, makes sleep a game with points and rewards.
App places phone by pillow to monitor sleep, provides sleep data, and matches sleep types with Pokémon.
Users get bonuses for setting and meeting bedtime goals, earning points and unlocking new Pokémon.
More sleep builds "drowsy power" for Snorlax in-game, helping players meet more Pokémon characters.
Part of strategy to sell Pokémon GO Plus devices, works with them to track sleep without phone.