Leadlids
This refers to the state at which someone can no longer keep their eyes open.
Boss: "You're late again Tony!" Tony: "Sorry Boss, I woke up early but I had leadlids so I fell right back to sleep..."
*wakes up after nap* "I want to go outside and ride my bike but I have leadlids..."
*wakes up after nap* "I want to go outside and ride my bike but I have leadlids..."