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Timing: Hypnic headaches usually start during sleep and wake the individual up, often around the same time each night. This is why it is sometimes referred to as “alarm clock” headache.
Later-life onset: Hypnic headaches typically begin later in life, with the majority of cases occurring in individuals aged 50 and older. However, there have been reports of hypnic headaches starting in younger individuals as well, although it is much less common
Frequency: Hypnic headaches tend to occur frequently, with episodes happening on at least 10 or more days per month.
Duration: The headaches usually last for at least 15 minutes after waking the person from sleep, but they can persist for longer.
Pain characteristics: The pain is often described as dull or throbbing and is usually bilateral (affecting both sides of the head).
The absence of daytime attacks is the main feature that distinguishes hypnic headache from most other headache types.
