A hypnic jerk is likely to occur during

The heart rate slows, breathing becomes more shallow and irregular, and an EEG would show the first signs of sleep spindles in _____ sleep.

Pieter was lying on the couch and had fallen asleep when all of a sudden his body jerked, and he woke up because he felt like he was falling. Pieter was most likely in which stage of sleep?

Nightmares are more common in children than in adults because

Which statement about sleep apnea is true?

Belen often experiences "sleep seizures" during the day. He probably suffers from

While in the middle of a conversation with his co-worker, Jackson unexpectedly slipped into a state of sleep, falling to the floor as he lost control of all the muscles in his body. Jackson appears to have a condition called

A person with sleep apnea