Microsleep is a brief, involuntary episode of sleep that can occur when a person is extremely tired.

Warning signs include excessive yawning, frequent or slow blinking, difficulty concentrating, trouble understanding information, losing focus and feeling extremely sleepy.

The Cleveland Clinic recommends getting enough sleep, maintaining a regular sleep schedule and taking breaks when tired to help prevent microsleep.

People experiencing the problem may also need to review medicines that cause drowsiness, get checked for sleep disorders and seek treatment for underlying health conditions.

Microsleep can affect concentration and awareness, making it important to address persistent tiredness.