The noun insomnia was borrowed from Latin insomnis "sleepless," from the prefix in-, "not," plus somnus, "sleep." Somnus is actually related to Greek hypnos "sleep," the source of English words such as hypnosis and hypnotic.
The noun insomnia was borrowed from Latin insomnis "sleepless," from the prefix in-, "not," plus somnus, "sleep." Somnus is actually related to Greek hypnos "sleep," the source of English words such as hypnosis and hypnotic.
