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There is no official deep-sleep target for every age group. Deep sleep, also called N3 or slow-wave sleep, is generally more abundant earlier in...

Hyperarousal insomnia describes the “tired but wired” pattern in which you need sleep but remain too mentally, physically, or sensory alert to settle easily....

How quickly you fall asleep can reveal useful clues about sleep pressure, body-clock timing, and pre-sleep arousal. But the number is easy to misread: falling...

Sleep anxiety is worry, fear, or tension about falling asleep, staying asleep, or the consequences of poor sleep. It can appear as bedtime anxiety,...

Brief awakenings during the night can be normal. Many are short enough that you never remember them. They become more important when something repeatedly...

Feeling exhausted does not always mean your brain and body are ready to fall asleep. Stress, anxiety, sleep timing, caffeine, naps, evening stimulation, physical...

At the same chronological age, people can experience aging very differently. One 45-year-old may wake up with energy, recover quickly after exercise, and maintain...

Chronic stress may affect how the body ages, especially when stress keeps returning and recovery stays poor. Over time, that pattern may influence inflammation,...