Sleep Science
Every Sleep Science article on Fall Asleep Tonight, newest first.
Groggy After a Full Night's Sleep? That's Sleep Inertia, Not Bad Sleep
That thick fog for the first 20 minutes after waking has a name and a real physiological cause, and it says almost nothing about how well you slept the night before.
The First 90 Minutes of Sleep Do the Heaviest Lifting
A bad start to the night costs you more than a bad middle or end does, and your sleep tracker's deep sleep graph probably isn't broken, even when the number looks low.
Why Some People Need 9 Hours of Sleep and Others Feel Totally Fine on 6
The 8-hour rule was never based on individual biology in the first place. Why sleep need varies so much between people, and how to figure out your own real number.