Serotonin performs a wide variety of jobs by carrying messages across brain cell connections. The neurotransmitter has been linked to behaviors including feeding, sleeping and aggression.
携带许多信息的血清素在脑细胞间的联系中发挥广泛的作用，神经递质一直与进食、睡眠和攻击行为有关。
2
They were bathed in chemicals that put the cells into a sleeping condition known as programmed cell death.
他们浸没在化学物质中，让细胞进入熟睡状态，这个过程被称为程序性细胞死亡。
3
A quarter of young people feel like they must be available by phone around the clock, according to a Swedish study that linked heavy cell phone use to sleeping problems, stress and depression.