Insomnia is a tier 1 symptom. It makes people unable to sleep, making them less productive. This increases the cure requirement by 3%. This symptom does increase severity, but has no effect on the infectivity of your disease.
- This symptom only raises severity a small amount, so it should be safe to evolve even at higher difficulties. With the tier 1 symptom Anaemia, it can make the Walking Dead symptom combo, which unlocks the Brainzzzz achievement.
Insomnia is a tier 1 symptom in the Necroa Virus DLC.