University of Copenhagen researchers have linked brief nighttime awakenings to better memory in mice, adding to our understanding of what happens in the brain during sleep.
transmitter noradrenaline wakes up the brain many times a night. These “microarousals” were linked to memory consolidation, meaning they help you remember the previous day’s events. In fact, the more “awake” you are during a microarousal, the better the memory boost, the research suggests.
The findings add insight to what happens in the brain during sleep and may help pave the way for new treatments for those who have sleep disorders.Previous research has suggested that noradrenaline – a hormone that increases during stress but also helps you stay focused – is inactive during sleep. So, the researchers were surprised to see high levels of it in the brains of the sleeping rodents.
“We have shown that the amount of these super-boosts of sleep spindles, and not REM sleep, defines how well you remember the experiences you had prior to going to sleep,” says Kjaerby. that shows we wake up roughly 100-plus times a night, mostly during NREM sleep stage 2 , Kjaerby says.
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