Linked from
The 8 pages that link to Hypnotic, each with the reason it gives.
SedativeRelated: Hypnotics overlap with sedatives but are specifically used to promote sleep.
Chloral hydrateNarrower topic: Its historical therapeutic role was chiefly as a sleep-inducing drug.
DepressantRelated: Depressant effects can be used therapeutically to treat insomnia.
MethaqualoneRelated: Methaqualone was prescribed as a sleep-inducing drug.