镇静催眠药是一类对中枢神经系统具有抑制作用的药物。镇静药能减轻焦虑症状,安定情绪。然而,在促进和维持近似生理睡眠的同时,一些催眠药物会影响睡眠时相的正常比例,产生一定的不良反应。多数镇静药加大剂量即可产生催眠作用,催眠药过量可引起全身麻醉,更大剂量可引起呼吸和 Sedative hypnotics are a class of drugs that have an inhibitory effect on the central nervous system. Sedatives can reduce anxiety symptoms and calm emotions. However, while promoting and maintaining similar physiological sleep, some hypnotic drugs can affect the normal proportion of sleep phase, resulting in some adverse reactions. Most sedatives to increase the dose can produce hypnotic effect, hypnotic drug overdose can cause general anesthesia, higher doses can cause respiratory and