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The word 'soporific' refers to something that induces sleep or has a sleep-inducing quality. Therefore, a synonym would be a word that conveys the same concept, which is 'sedative.' A sedative is a substance that promotes calmness or induces sleep, making it a fitting synonym for soporific.

The other options do not align with the meaning of soporific. 'Awakening' refers to the act of waking up or becoming alert, which contradicts the sleep-inducing quality of soporific. 'Exciting' clearly implies stimulation and activity, further distancing it from the essence of sleep inducement. Similarly, 'stimulating' suggests an increase in energy or alertness, which is in direct opposition to the meaning of soporific.