Question

which is a feature of rem sleep?
low brain activity
temporary immobility
sleepwalking
decreasing heart rate

Explanation:

To determine the feature of REM sleep, we analyze each option:

• "low brain activity": REM sleep is associated with high brain activity (similar to wakefulness), so this is incorrect.
• "temporary immobility": During REM sleep, the body experiences muscle atonia (temporary immobility) to prevent acting out dreams, which is a key feature.
• "sleepwalking": Sleepwalking occurs during non - REM (NREM) sleep, not REM sleep.
• "decreasing heart rate": In REM sleep, heart rate can be irregular and may increase, not decrease.

Answer:

B. temporary immobility