'Sleep inertia' refers to:

The inability to fall asleep during rest periods

The period of impaired cognitive performance immediately after waking from sleep

Correct

Resistance to sleep during night flights

Cumulative fatigue from multiple sectors

Explanation

Sleep inertia is the temporary grogginess and reduced performance lasting 15-30 minutes after waking, particularly from deep sleep stages.

Test yourself with random questions from Operational Procedures and all other ATPL subjects.