Which sleep-wake pattern involves going to bed and waking later than the desired times?

Which sleep-wake pattern involves going to bed and waking later than the desired times?

• A. Advanced sleep phase type
• B. Delayed sleep phase type
• C. Jet lag
• D. Insomnia

Answer: (B)

Delayed sleep phase type is a circadian rhythm sleep-wake disorder where the internal clock runs later than desired, so individuals naturally fall asleep and wake up much later than they intend. They often have normal total sleep time but struggle with conventional bedtimes and morning obligations, leading to daytime sleepiness or sleep deprivation on weekdays. This pattern is different from an advanced sleep phase type, which involves earlier-than-desired bedtimes and awakenings; jet lag is a temporary misalignment after crossing time zones; and insomnia focuses on difficulty falling or staying asleep regardless of the clock time. Treatment aims to shift the schedule earlier through morning light exposure, evening melatonin to advance sleep timing, and maintaining a consistent sleep-wake routine.

Delayed sleep phase type is a circadian rhythm sleep-wake disorder where the internal clock runs later than desired, so individuals naturally fall asleep and wake up much later than they intend. They often have normal total sleep time but struggle with conventional bedtimes and morning obligations, leading to daytime sleepiness or sleep deprivation on weekdays. This pattern is different from an advanced sleep phase type, which involves earlier-than-desired bedtimes and awakenings; jet lag is a temporary misalignment after crossing time zones; and insomnia focuses on difficulty falling or staying asleep regardless of the clock time. Treatment aims to shift the schedule earlier through morning light exposure, evening melatonin to advance sleep timing, and maintaining a consistent sleep-wake routine.