REM sleep always begins immediately after stage 4 sleep.

Name: REM sleep always begins immediately after stage 4 sleep.
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Quizplus · Accepted Answer

Stage 4 sleep is also known as delta sleep and is categorized as non-REM sleep. REM sleep is a separate phase of sleep that typically occurs 90 minutes after falling asleep and involves rapid eye movements, muscle paralysis, and vivid dreaming. REM sleep does not always immediately follow stage 4 sleep, as non-REM sleep stages occur in cycles throughout the night.

REM Sleep Always Begins Immediately After Stage 4 Sleep