研究人员发现，一些电子产品在夜间发出的人造光可能会减少大脑中有助于睡眠的化学物质。
Researchers find that man-made light from some electronic products at night may reduce the brain chemicals that help sleep.
许多人发现听轻音乐有助于睡眠。
Many people find that listening to soft music helps them to sleep well.
锻炼有助于睡眠，它让大脑产生有益的化学物质改善睡眠。
Exercise promotes sleep and improves sleep quality by altering brain chemistry.
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