Home to sleep not used because your brain in the night
kexuemeiguorenzhongwen· 2016-05-03 12:40:03
, as the birds and dolphins are sleeping, the brain is still wary of predators, and half of the human brain seems to be alert to the new environment at rest. < p < p align = "center" >< p > stable pillows, warm down, new sheets, even live in the comfort of a luxurious hotel, first night home and ordinary night compared. It's like a nightmare.
this phenomenon is more familiar to sleep researchers, it has even been called a name: the first night effect. For some reason, when we in the strange place to sleep, often spent a restless night, after getting up will also feel weak and drowsy.
scientists have studied the brain about half a century of sleep, hoping to crack the mystery of the first night effect. In a recent study, a team of researchers in the United States has made new progress. When we are in a new environment, our brains seem to be on the first night of the monitor mode. When a brain hemisphere sleep, another brain hemisphere in the night. < p > "if we don't know whether it's safe to a room, we will open the nighttime surveillance system in order to sleep anomaly detection situation," Brown University sleep scientist Masako Tamaki said. "It's like a security measures." < p > if this finding is confirmed in further studies, then first night effect is essentially a from birds to prevent is nocturnal predators and take "open one eye closed one eye, keep half of the brain awake sleep mode. Dolphins also adopt a similar strategy, so that the left and right sides of the brain sleep, so as to guard against the sharks.
in order to study the effect of the first night, Tamaki and his team used a series of sophisticated brain imaging technology. They used a brain magnetic map (MEG), structural magnetic resonance imaging, and a multiple sleep pattern (combined with muscle strain measurements and other measurements to monitor the details of 35 people's sleep in the lab). < p > in the night, scan showed subjects from the brain's right hemisphere sleep peacefully, as usual, but the left half of the brain remained active. The researchers then tested the participants' responses to the sound during sleep. They started per second playing a bass, the brain in largely ignored these sounds, but when researchers occasionally joins the unusual sound, such as a soprano, the left half of the brain is stimulated, and it might wake up. Masako says the findings may suggest that the brain's nighttime surveillance system is alert to the abnormal sound that represents the danger. According to the paper published in contemporary biology, this effect disappeared in the second night.
scientists are not sure if it has been the left half of the brain in the first night effect more alert. They only recorded brain activity within 90 minutes of sleep, so it is likely that humans, like dolphins, will switch back and forth between the 2.5 brain during sleep. "The left and right sides of the brain are likely to be in a state of alert," Tamaki said."
and often sleep in the new environment, the first night effect brought about by the trouble is not obvious, this is because their brains have adapted to this environment changes. "The human brain is very flexible." Sasaki Yuka, co-author of the study, said. She added that people who suffer from the effects of the first night's effects can reduce their symptoms by traveling with a pillow or a similar place in their own room. < p > Surrey University and director of the center for sleep Derk Jan Dijk said that this study is based on a 1996 study, when researchers in Florida first use of EEG to analyse this phenomenon. "The first night effect is a real effect. Your sleep quality in the new environment is not as good as you sleep in the bedroom in the bedroom. This has long been known and used as a sleep disorder." He said, "and what these researchers have done is to prove that in the first night, the people of the 1.5 brain sleep better than the other 1.5."
the findings may explain the problems raised by patients with insomnia at the center for sleep research. The patient would say that they had not slept all night, and the EEG recordings of their brain activity confirmed this. "If you have a high density of EEG, you can sometimes find that some of these patients will have an awakening signal. Therefore, this finding provides data support for the theory that sleep is not a complete brain phenomenon. Sleep is a part of the brain. The brain can be partially awake, and this may be the first night's effect on the state of the brain." Dijk says.
wrote: Ian Sample
Qin Qikai: Translation: Hu Jiaxi.