Question

which of the following suggests that a certain amount of dreaming each night is necessary?

• if deprived of rem sleep, a person is more likely to sleepwalk or sleep talk.
• dream sleep increases during the night, with longer, more vivid dreams occurring later.
• if deprived of rem sleep one night, a person will spend more time in rem sleep the next n
• dream sleep is highly valued by most cultures.

Explanation:

REM sleep is strongly linked to dreaming. The phenomenon where the body compensates for lost REM sleep by spending more time in REM the next night (called REM rebound) indicates that this stage (and associated dreaming) is biologically necessary for the body. The other options do not demonstrate necessity: sleepwalking/talking occur in non-REM sleep, the timing of dreams does not show necessity, and cultural value is a social construct, not evidence of biological need.

Answer:

If deprived of REM sleep one night, a person will spend more time in REM sleep the next night.