Quoted TextTo drop off we must cool off; body temperature and the brain's sleep-wake cycle are closely linked. That's why hot summer nights can cause a restless sleep. The blood flow mechanism that transfers core body heat to the skin works best between 18 and 30 degrees. But later in life, the comfort zone shrinks to between 23 and 25 degrees - one reason why older people have more sleep disorders.
Exposure to noise at night can suppress immune function even if the sleeper doesn’t wake. Unfamiliar noise, and noise during the first and last two hours of sleep, has the greatest disruptive effect on the sleep cycle.
Tiny luminous rays from a digital alarm clock can be enough to disrupt the sleep cycle even if you do not fully wake. The light turns off a "neural switch" in the brain, causing levels of a key sleep chemical to decline within minutes.
Some studies suggest women need up to an hour's extra sleep a night compared to men, and not getting it may be one reason women are much more susceptible to depression than men.
Scientists have not been able to explain a 1998 study showing that a bright light shone on the backs of human knees can reset the brain's sleep-wake clock.
Diaries from the pre-electric-light-globe Victorian era show adults slept nine to 10 hours a night with periods of rest changing with the seasons in line with sunrise and sunsets.
Quoted TextThe blood flow mechanism that transfers core body heat to the skin works best between 18 and 30 degrees. But later in life, the comfort zone shrinks to between 23 and 25 degrees - one reason why older people have more sleep disorders.
Quoted from Spring
What does this mean? If this is the norm, I shouldn't have ever slept in my life! 'Splain, man!
Quoted from Rachel DMy boyfriend is random with his sleep. He'll go for say a month on night hours then will stay up for a whole day and get back on day hours. When he sleeps he normally jumps up after 5 hours. If he works hard he can sleep for 8. Once it catches up with him he will sleep 10 hours maybe................................. Anyone heard of anything like this?