I was using depressants to wind down and go to sleep.

用镇抑剂来放松和助眠。

Opiates and opioids are central nervous system or CNS depressants.

麻醉剂和阿片类药物是中枢神经系统或中枢神经系统抑制剂。

But heroin, a depressant, slows breathing — reducing the body's oxygen supply just when it needs more.

但是海洛因作为一种镇静剂，会使呼吸减缓——从而使身体在需要更多氧气时，降低身体的供氧量。

Alcohol is a nervous system depressant, meaning it slows down all processes of the brain.

酒精是一种神经系统抑制剂，会放慢大脑所有的过程。

The thought acted as a further depressant—he opened his paper and began to read again.

这个想法让他更加沮丧——他打开报纸， 重新开始阅读。

Psychoactive substances are commonly grouped according to whether they are stimulants, depressants, or hallucinogens.

精神活性物质通常根据兴奋剂、镇静剂或致幻剂进行分类。

Stimulants initially speed up or activate the central nervous system, whereas depressants slow it down.

兴奋剂最初会加速或激活中枢神经系统，而抑制剂会减慢其速度。

But heroin, a depressant, slows breathing— reducing the body’s oxygen supply just when it needs more.

但是海洛因是一种镇静剂， 会减慢呼吸—— 在身体需要更多氧气时减少其氧气供应。

Insomnia is also a common side effect of stimulants like caffeine, as well as depressants like alcohol, which can both disrupt the regular sleep cycle.

失眠是精神刺激性物质的常见副作用，例如咖啡因，同时，抑制剂也可以导致失眠，比如酒精；这两类都可以干扰正常的睡眠周期。

Substance use and abuse also can cause chemical changes in the brain that affect mood-alcohol and some drugs are known to have depressant effects.

药物的使用和滥用也会引起大脑的化学变化，从而影响情绪酒精和一些药物已知有抑制作用。