What is the normal percentage of TST spent in REM?

What is the normal percentage of TST spent in REM?

• A. 20-25%
• B. 50%
• C. 35%
• D. 5-10%

Answer: (A)

REM sleep typically accounts for about one-fifth to one-quarter of total sleep time in healthy adults. In practical terms, that’s roughly 20-25% of your night, so if you sleep eight hours, expect about 1.5 to 2 hours in REM. The first REM period usually appears about 90 minutes after sleep onset and tends to lengthen with later cycles. Age affects this: infants spend about half their sleep in REM, while older adults may have slightly less REM. The other percentages listed don’t match the usual adult pattern—50% is more typical of infancy, 35% is higher than the average adult, and 5-10% is too low for REM in a normal adult sleep pattern.

REM sleep typically accounts for about one-fifth to one-quarter of total sleep time in healthy adults. In practical terms, that’s roughly 20-25% of your night, so if you sleep eight hours, expect about 1.5 to 2 hours in REM. The first REM period usually appears about 90 minutes after sleep onset and tends to lengthen with later cycles. Age affects this: infants spend about half their sleep in REM, while older adults may have slightly less REM. The other percentages listed don’t match the usual adult pattern—50% is more typical of infancy, 35% is higher than the average adult, and 5-10% is too low for REM in a normal adult sleep pattern.