What's the opposite of 'soporific'?

Solution 1:

It's not exactly the same, since it has meanings other than just non-drowsy, but you can probably use:

invigorating: adj. making one feel strong, healthy, and full of energy.

When talking about a soporific in terms of the noun, a drug that makes you drowsy, the opposite of that would be a stimulant, so you may also be able to use stimulating as an antonym. To me, though, that often has too much of an over-active ot hyper-active connotation to it.

Solution 2:

awakening

dictionary.com

adjective--1. rousing*; quickening

*(rousing meaning to bring out of a state of sleep, unconsciousness, inactivity)

Wiktionary

adjective--Rousing from sleep, in a natural or a figurative sense; rousing into activity; exciting; as, the awakening city; an awakening discourse; the awakening dawn.

revitalizing

Collins dictionary

adjective--having the ability or tendency to restore strength

rejuvenating

Merriam-Webster

adjective--having a renewing effect on the state of the body or mind

stimulative

Merriam-Webster

adjective--having a renewing effect on the state of the body or mind

energizing

Collins dictionary

adjective--that energizes someone

Solution 3:

This is quite awhile ago, I see; but my advice is that your use of the "bedroom's effect" should be described as lacking the soporific effect that it is supposed to have.