Which of the following statements regarding REM sleep is true
A-REM sleep occurs only during stage 4 sleep
B-REM sleep occurs during stage 3 sleep
C-Dreaming causes major muscle contractions and tossing and turning
D-Roughly 20 percent of adults sleep time is accompanied by REM
D- Roughly 20 percent of adults sleep time is accompanied by REM
The statement D is true. Roughly 20 percent of adults' sleep time is accompanied by REM sleep.
To identify which of the given statements regarding REM sleep is true, we need to analyze each statement and evaluate its accuracy.
A - REM sleep occurs only during stage 4 sleep: This statement is not true. REM sleep actually occurs during a stage of sleep known as Rapid Eye Movement (REM) sleep. REM sleep is distinct from the other stages of sleep, which are categorized as non-REM sleep.
B - REM sleep occurs during stage 3 sleep: This statement is also not true. REM sleep occurs after stage 3 sleep. Stage 3 sleep is a deep sleep stage known as slow-wave sleep and does not typically involve REM sleep.
C - Dreaming causes major muscle contractions and tossing and turning: This statement is false. While dreams can be vivid during REM sleep, our body enters a state of muscle paralysis known as REM atonia. This prevents us from acting out our dreams and reduces muscle contractions and movements during this stage.
D - Roughly 20 percent of adults' sleep time is accompanied by REM: This statement is true. On average, adults spend approximately 20% of their sleep time in REM sleep. However, it's important to note that this can vary between individuals and throughout the sleep cycle.
Based on the analysis, the correct answer is D - Roughly 20 percent of adults' sleep time is accompanied by REM.