On a normal night, a person goes through different stages of sleep. During which stage of sleep is the largest amount acetylcholine (i.e. the "rest and digest" hormone) released?

Gina is in the middle of her workday, she is fully focused and alert to the new information she is reviewing on her computer screen. After a while, she sits back in her chair and takes a few deep breaths with her eyes closed to relax. What of the following pairs of brain waves and corresponding hertz best identifies what Gina's brain is producing while concentrating and while at rest?

On a normal night, a person goes through different stages of sleep. During which stage of sleep does a person experience twitches, hypnic jerks and hypnagogic hallucinations?

On a normal night, a person goes through different stages of sleep. During which stage of sleep can delta waves be seen, the slowest of all sleep waves?

Insomnia is best defined as which of the following?