3 reasons why the first 90 minutes after falling asleep matter
When you just fall asleep at night, it’s not long since you’ve fallen asleep, so even if you think you’ll be awakened by the noise around you, it’s actually not. This is because, shortly after falling asleep, you fall into a deep sleep called non-REM sleep. Professor Seiji Nishino of Stanford, author of , calls this first non-REM sleep period ‘the golden 90 minutes’ and says it is the most important moment in bed that day. Why?
Determine the quality of your sleep that day
When the first 90 minutes of deep sleep appear, the sleep rhythm for the entire day is likely to be in order. In that sense, if you don’t sleep properly for the first 90 minutes or wake up, the quality of your sleep that day is messed up. In addition, when you enter deep sleep in the early stages, the parasympathetic nerve becomes smooth, the autonomic nerve is balanced, and the wastes in the brain are cleaned and the immune function is activated.
Gain long-term memory
When awake, information is acquired, during non-REM sleep, information from when awake is sent to long-term memory, and during REM sleep, while dreaming, old and new memories are integrated at the same time. Golden 90-minute non-REM sleep is a very important time for long-term memory. It is even a time to erase unwanted memories.
Growth hormone is secreted
In some ways, this may be the most important item. After falling asleep, growth hormone is secreted when you fall asleep deeply. However, there are two misunderstandings about growth hormone. It is known that growth hormone is secreted between 10:00 pm and 2:00 am, but it is not. The time of day does not matter, and 70-80% is secreted during deep sleep after falling asleep. The second misconception is that adults do not produce growth hormone. Not like that. Growth hormone is also secreted in adults. Growth hormone is responsible for the proliferation of cells and the promotion of normal metabolism, and plays a particularly important role in preventing aging.
I hope you fall asleep and stick to the first 90 minutes.