The Fitbit Air now comes in a Pokémon Sleep Special Edition with a Sleeping Pikachu strap. The special edition tracker keeps its lightweight design, week-long battery, 50-meter water resistance, optical heart-rate sensor, and skin-temperature monitoring. Overnight sleep and naps sync automatically with Pokémon Sleep through Health Connect on Android or Apple Health on i OS.

Sleep Score boosts Snorlax's Strength to create "Drowsy Power," with higher scores unlocking rarer Pokémon sleep styles. The Fitbit Air made its quiet debut earlier this year as Google's lightest wearable yet, weighing just 12 grams total. It's designed to be worn and forgotten during sleep.

Under the hood is Google Health's sleep tracking, which now uses machine learning algorithms 15% more accurate at picking up sleep stages, naps, and overnight interruptions. Preorders start today at the Google Store and Target, with shipping beginning September 15. It's limited to the U.S. and Japan.