El sueño

 Y la vigilia:

"A new perspective on insomnia

Sleep clinicians note that brief awakenings are normal, often appearing at stage transitions, including near REM sleep, which is associated with vivid dreaming. What matters is how we respond.

The brain’s sense of duration is elastic: anxiety, boredom, or low light tend to make time stretch, while engagement and calm can compress it. Without that interval where you got up and did something or chatted with your partner, waking at 3am often makes time feel slow. In this context, attention focuses on time and the minutes that pass may seem longer.

Cognitive behavioural therapy for insomnia (CBT-I) advises people to leave bed after about 20 minutes awake, do a quiet activity in dim light such as reading, then return when sleepy.

Sleep experts also suggest covering the clock and letting go of time measurement when you’re struggling to sleep. A calm acceptance of wakefulness, paired with an understanding of how our minds perceive time, may be the surest way to rest again."

De

https://theconversation.com/why-we-used-to-sleep-in-two-segments-and-how-the-modern-shift-changed-our-sense-of-time-267909?fbclid=IwY2xjawN0SCNleHRuA2FlbQIxMQABHitOE2PPkL5XIKB0uqTYCysyHPAC5J3ov5oZfJOzx6UxkDF3Q7eCBOSh3D05_aem_anjldfHqPph-8dzlMQ12kA