Sublingual melatonin is a fast-acting sleep aid, available as sprays or dissolving tablets, that's placed under the tongue for direct absorption into the bloodstream, bypassing the digestive system for quicker effects on sleep regulation, jet lag, and shift work. It works faster than traditional pills, often requiring a lower dose, and dissolves in the mouth without water, but always follow product instructions and be cautious about driving or operating machinery after use.

