This phenomenon is known as “sleep inertia”: if you’re awakened during certain stages of deep sleep, you’ll generally feel foggier and tired for longer after wa

This phenomenon is known as “sleep inertia”: if you’re awakened during certain stages of deep sleep, you’ll generally feel foggier and tired for longer after waking up. https://en.wikipedia.org/wiki/Sleep_inertia#Causes https://en.wikipedia.org/wiki/Sleep_inertia#Causes